melting point of impure sulfanilamide

For any problem, leave comment. If you have an ice bath the temperature is zero deg C until all the ice melts but if you had salt and mix there is a fall in temperature. I guess I should point out that you need to consider walking over hot rocks vs walking in say an inch of water at the same temperature. However, if the observed melting temperatures are outside of this range, then the compound is not pure. For example, if a solid has a minor amount of impurity, the impurity will quickly melt at the eutectic temperature (point a in Figure 6.9a), and the melting temperature will increase, following the melting point line in the phase diagram. For example, a solid that is $20\%$ compound A and $80\%$ compound B would have a final melting temperature of point c in Figure 6.7b. Specificall, experiment, the temperature was adjusted to af, solubility increases with increasing temperature. The furthest left side of the graph represents a sample that is pure compound "A," while the furthest right side of the graph represents a sample of pure compound "B." Is your sample impure, or did you heat too fast? Solubility of Fluorene in Various Solvents at Various Temperatures. e; Part A: Table 1. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. In Part B, we will be the most common procedure used to purify crude solids in the organic laboratory. For most substances, the Business Law: Text and Cases (Kenneth W. Clarkson; Roger LeRoy Miller; Frank B. hazard Separately, add ~6 mL of 95% ethanol and your magnetic spin bar to your 50-mL Erlenmeyer flask. https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Organic_Chemistry_Lab_Techniques_(Nichols)/06%3A_Miscellaneous_Techniques/6.01%3A_Melting_Point/6.1C%3A__Melting_Point_Theory, We've added a "Necessary cookies only" option to the cookie consent popup. This continues until the entire sample is melted. Percent Recovery of Pure Sulfanilamide through Crystallization and Melting In the old fashioned process, we used buttermilk sugar and a bit of vanilla. Melting Point for Known Compounds Explanation of melting and boiling point deviations Characteristic Properties - Melting and Boiling Points Crystallization of Impure Sulfanilamide using 95% Ethyl Alcohol Hypothesis Testing NMR Spectrum of Caffeine and Vapor Pressure of Sublimation Ranking Compounds by Expected Melting Points soluble in methyl alcohol at room temperature but is going to be soluble if that You will crystallize a sample of impure sulfanilamide by dissolving it in the minimum amount of boiling 95% ethyl alcohol (78 C) and then cooling the solution, first to room temperature, and then to 0 C in an ice-water bath. a certain solvent at a specific temperature or pressure. Can archive.org's Wayback Machine ignore some query terms? The melting point is an important physical property that can be used to determine the purity and identity of a compound. irritant; Melting point depression is the result of different changes in entropy when melting a pure and impure solid. affinity for molecules of its own kind than for the impurities, they leave behind the impurities O Urea Water or Hexane NH 2 O H 2 N 5. If unknown C was acetylsalicylic acid, then the melting point of the mixture should have been relatively close to the melting range of acetylsalicylic acid, 138 C to 140C. >> Finally, the It has a density of 1.08 g/cm 3 and a melting point of 164.5-166.5 C. Meaning a polar compound will If the melting point is within the scientifically accepted range of the material's melting temperature, then the material is presumed to be pure. Mass of watch glass (g) 48. seeing if the mp width is less than 2.0 which shows purity, but any larger than that it's impure. In Part C of this experiment, we will determine the identity of an general technique involves dissolving the material to be crystallized in a hot solvent (or A droplet of liquid is not seen until approximately $10$-$20\%$ of the sample has melted. Can I tell police to wait and call a lawyer when served with a search warrant? The difference between the phonemes /p/ and /b/ in Japanese. 178 101 Irritant; ncdu: What's going on with this second size column? Introduction: The purpose of this experiment is to introduce the technique of crystallization, a very common procedure used to purify crude solids in the organic laboratory. Mass of pure fluorene (g) 0. Table 4. Your actual mass used was 0.28 g. 2. : an American History (Eric Foner), Forecasting, Time Series, and Regression (Richard T. O'Connell; Anne B. Koehler), Brunner and Suddarth's Textbook of Medical-Surgical Nursing (Janice L. Hinkle; Kerry H. Cheever), Campbell Biology (Jane B. Reece; Lisa A. Urry; Michael L. Cain; Steven A. Wasserman; Peter V. Minorsky), Psychology (David G. Myers; C. Nathan DeWall), Chemistry: The Central Science (Theodore E. Brown; H. Eugene H LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward). Melting Point Range of Impure Sample C 110-113. Therefore, by process of elimination, unknown C was identified as benzoin. At the option of the instructor, turn in your crystallized material in a properly labeled container, Preparations. >> However, the melting point of impure sulfanilamide may be different due to the presence of impurities. The melting point of the solid from the mother liquid was 162 -165, which is not the same as the crystallized material because the solid from the mother liquid may have traces of impurity which accounts for the melting point depression. In part B, by comparing the solubility of impure fluorene in the 3 solvents in room temperature and in a hot water bath, the best solvent for the crystallization of impure fluorene was identified as methanol, as shown in Table 3, because fluorene was only partially soluble in methanol in room temperature and completely soluble in methanol at a higher temperature. The melting point of a substance is often used to determine purity. [5], Sulphanilamide is contraindicated in those known to be hypersensitive to sulfonamides, in nursing mothers, during pregnancy near term and in infants less than 2 months of age. The dissolved material has a decreased In this experiment, you will carry out a crystallization of impure sulfanilamide using 95% ethyl alcohol as the solvent. It is also known as 4-aminobenzenesulfonamide or 4-aminobenzenesulphonamide. endobj Please see attached lab report. 6 0 obj Melting point depression occurs due to the nature of a material's solid state. Originally, fluorene has a melting range of 116C to 117C. Solubility: 7.5 g/L @ (20C) Mass of watch glass + Pure fluorene g 48. %PDF-1.3 As compound B is dissolved into the melt (causing it to become more impure), the freezing point of this mixture is depressed. point So that solute is properly dissolved in the hot solvent. How many grams of A would come out of solution? Objectives: The temperature at which a solid melts is known as the melting point (MP) of that substance. May cause respiratory tract irritation. xZF}W4+ }3mRD(_J~(SE-!UN]LYKYiVT555ut2{{iosTI]t]}oTg^~%)e}G1mh3k+J"[^:Z}MKkGnl} u3M$iN]A;ZkYs`_oJu?~oMwG;CZq$m2KJC(Kw3dU]-4M20s&fp:+Swym6i%`l7(~dbn|7}pcin6Q( ;wF`M%#~{YNcU~)oku" `*YiQ7MOY1g8d^M+VZbimx#:`nhxgx`63zukO)9!##I]1p(oP Impurities can be introduced into the compound during its synthesis or during its handling and storage. Report the melting points for both the impure sulfanilamide and the crystallized sulfanilamide and comment on the differences. Skin: Wear appropriate protective gloves to prevent skin exposure. Critical thinking (D): The best crystallization solvent is the solvent that does not We know that fluorene is non-polar so as like dissolves like it will be Cholesterol, mostly non polar, very slightly polar. The presence of impurities in a substance results in a lower melting point due to a process called melting point depression. Sulfanilamide is a white, crystalline compound that is used as an antibiotic and as a raw material in the production of other pharmaceuticals. In this experiment, crystallization was conducted to purify an impure sample of slight Finally, unknown C was identified as benzoin through melting The If unknown C was acetylsalicylic acid, then the melting OF3 rhe ethanol is heated to completely dissolve the sulfanilamide. A sufficient change in temperature that ultimately lowered the solubility allowed the formation of the crystalline solid in this experiment. As the melting temperature does not rise above the eutectic temperature until the entirety of the impurity has melted, the quantity of impurity will determine how far the system will have progressed along the melting point line in the phase diagram before reaching the visible minimum of $10$-$20\%$ of solid. produce a supersaturated solution that eventually forms crystals. 2 0 obj zvG&ykc>E1F`T &q'w#4|]_"iSp:.CpZS$RiaGL.Fc}5x3n`"P&J+O4dA45,H(N;s:#0;GC Replacing broken pins/legs on a DIP IC package. The purity of the final material after crystallization will be determined by observing the color of your crystals and by performing a melting point on your sample. sul- fanilamide in 95% ethyl alcohol as the solvent. It only takes a minute to sign up. true /ColorSpace 12 0 R /SMask 13 0 R /BitsPerComponent 8 /Filter /FlateDecode The typical behavior of an impure solid containing two components is summarized by the general phase diagram in Figure 6.7a. And ice cream (being an "impure" water mixture) is a liquid, not solid, at $\pu{32F}$. hazard, 99 126 Irritant, A pure compound melts at 48-49 degrees Celsius. Record the actual mass (to 4 decimal places) in your notebook. Sulfanilamide is one of the sulfa drugs, the first generation of antibiotics to be used in successfully treating many major diseases such as malaria, tuberculosis, and leprosy. The process of melting the ice cools down the ice/salt water mixture. Is your sample impure, or did you heat too fast? This increases the purity of the melt, so the melting temperature increases somewhat. isolated should have been a very small amount, as not much impurity should be soluble in value that indicates an impurity Effect of sample height on mp data is increased height causes the mp range to be wider and lower the onset point. Specifically in this experiment, the temperature was adjusted to affect the solubility. Methyl alcohol has both polar and nonpolar parts so fluorene is not Crystallization methods are designed to produce a supersaturated solution that eventually forms crystals. Unknown C by itself had a melting range of 138. In conclusion, the melting point of impure sulfanilamide may differ from the melting point of pure sulfanilamide due to the presence of impurities. Urea is highly polar, soluble in water, poorly soluble in hexane and crystallisable in Ethyl alcohol also has an intermediate polarity. [2][3] Sulfanilamide is rarely if ever used systemically due to toxicity and because more effective sulfonamides are available for this purpose. comparable melting points when each is pure, provides a useful laboratory technique. Pure and Impure Samples of Fluorene. 74 -116. In part A, 0. IF the melting point has decreased compare to the lit. within its primary melting point range. Some of the deductions in the percentage of recovery were due to the impurities being left behind in the mother liquor and others were due to the use of too much solvent in the process of dissolving the solid with heat because the solid compounds have a higher affinity for the solvent at a higher temperature. Une chimie qui gurit: Histoire de la dcouverte des sulfamides. is a hazard so this is a concern. If absorbed, systemic side effects commonly seen with sulfanilamides may occur. The recorded melting range for this system would be at the maximum between temperatures a and c, but if the first droplet is seen at point b, the recorded melting range would be between temperatures b and c. A melting point is a useful indicator of purity as there is a general lowering and broadening of the melting range as impurities increase. If not, there was a depression in the melting point of Although all samples start melting at the eutectic temperature, the first droplet of liquid is not seen until approximately $10$-$20\%$ of the sample has microscopically melted. In part C, the melting point range of unknown C was compared to the melting points of various compounds shown in Table 6. the impure sulfanilamide and the total weight is very similar in mass because the impurity Create three research questions that would be appropriate for a historical analysis essay, keeping in mind the characteristics of a critical r, Carbon Cycle Simulation and Exploration Virtual Gizmos - 3208158, 1.1 Functions and Continuity full solutions. If you were to add salt to the recipe, then you'd have to cool it even MORE to get it to freeze (although a little salt makes it taste better, imho). Melting point depression is the phenomenon of reduction of the melting point of a contaminated, impure material compared to the pure material. water bath. Remove contaminated clothing and wash before reuse. Econ 1 - Chapter 1 Questions and Answers. The melting point of a substance decreases with increase in presence of impurities in it. benzene. which allowed for crystallization. On the other hand, the solubility of a When an impure solid is warmed, microscopic melting first occurs in a pure region by the component with the lower melting point (compound A in Figure 6.7a). which is higher than the melting point of the solute fluorenol (153-154 oC). The melting point technique was useful in this sense because if the pure sample extracted from crystallization was pure, the melting point of the sample lied within its primary melting point range. PABA can also reverse the effects of sulfonamides. Percent Recovery 62% Melting Point Range of Pure Sample C 116-117. [5][10] PABA is needed in enzymatic reactions that produce folic acid, which acts as a coenzyme in the synthesis of purines and pyrimidines. The melting point of the impure sulfanilamide was 1650 1685 C which was lower. YuaoJ; ?,:kEC)61_\C4%kQ?(- YK'] ty. You will also weigh your sample and calculate the percent recovery. Legal. For driving and general transport, ice on the roads/walkways, etc. 50c. utilized to verify the purity of the final material. A mathematical description is in Figure 6.8b: as $\Delta S^\text{o}$ is the denominator in the final equation, a larger $\Delta S^\text{o}$ corresponds to a smaller $T_\text{melting}$. The melting point of pure sulfanilamide is around 303-305C. Results and Discussion Try it at home Mixing salt will result in liquid water that can stay liquid below $0^oC$. As shown in Table 4, a pure sample collected through crystallization was relatively pure, with a melting range of 116.3C to 117.8C. Lesson 8 Faults, Plate Boundaries, and Earthquakes, Copy Of Magnetism Notes For Physics Academy Lab of Magnetism For 11th Grade, Chapter 02 Human Resource Strategy and Planning, Week 1 short reply - question 6 If you had to write a paper on Title IX, what would you like to know more about? The temperature is then slowly increased until the compound melts. Acetaminophen is moderately polar meaning it is soluble in ethanol, poorly soluble in On the other hand, impure sample of fluorene had a melting range of 110C to The lines mark the solid-liquid transition temperature (melting points). Melting Ranges of Unknown C Compound Melting Range C Unknown C 138- Unknown C 0 g + Acetylsalicylic Acid 0 g 122. This is analogous to evaporation cooling down our bodies when our sweat evaporates. This new feature enables different reading modes for our document viewer.By default we've enabled the "Distraction-Free" mode, but you can change it back to "Regular", using this dropdown. As solids are restricted in atomic motion, there is little difference in entropy between a pure and impure solid. In part C, the melting point range of unknown C was compared to the melting points Use MathJax to format equations. The second. [5], InChI=1S/C6H8N2O2S/c7-5-1-3-6(4-2-5)11(8,9)10/h1-4H,7H2,(H2,8,9,10). Introduction: Accessibility StatementFor more information contact us [email protected] check out our status page at https://status.libretexts.org. Expert Answer Melting point of impure sulfanilamide is lower than melting point of pure sulfa View the full answer In addition, the best solvent for recrystallizing an unknown solid will be determined and identified . Using Kolmogorov complexity to measure difficulty of problems? Copyright 2023 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01, the most common procedure used to purify crude solids in the organic laboratory. Compound B will continue to dissolve in the melt, until it reaches the eutectic composition (point a in Figure 6.7b), and the system will continue to melt at this composition until the entirety of the minor component (the impurity) is dissolved. . [5][12][11], Sulfanilamide was first prepared in 1908 by the Austrian chemist Paul Josef Jakob Gelmo (18791961)[13][14] as part of his dissertation for a doctoral degree from the Technische Hochschule of Vienna. The, general technique involves dissolving the material to be crystallized in a hot solvent (or, solvent mixture) and cooling the solution slowly. It has a max of 255 and 312 nm. We are expected to high temperature. Sulfanilamide Safety Data Sheet according to Federal Register / Vol. Through the Mass of watch glass (g) 48. collected through crystallization was relatively pure, with a melting range of 116C to It is instructive to look at the structure of sulfanilamide and ask whether or not 95% ethyl alcohol should be a reasonable solvent for crystallizing this substance. The term "sulfanilamides" is also sometimes used to describe a family of molecules containing these functional groups. Sulfanilamide 165-167 2-Aminophenol 174 4-Toluic acid 180 . The melting point of pure sulfanilamide is around 303-305C. This lattice is held together by intermolecular forces that create a strong, stable structure. An impure solid is typically heterogeneous on the microscopic level, with pure regions of each component distributed through the bulk solid much like granite. Also, compare these to the literature value. Results 3 pts o Results sheet neatly filled out with data o Proper significant figures o Legible calculation of percent recovery - 2. water, methyl alcohol, and toluene, were analyzed to determine the most appropriate solvent It is metabolized by acetylation like other sulfonamides and excreted through the urine. By using the recrystallization technique and observing its appearance and finding Its melting point, a purer form of sulfanilamide would be obtained. Effect of impurities on melting and boiling points. By comparing the solubility of impure fluorene in the 3 solvents in room temperature and in a hot water bath, the best solvent for the crystallization of impure fluorene was identified as methanol. in this experiment we will get introduced to the technique of crystallization, In part A of this experiment we will carry out a crystallization of impure, crystallization will be used to purify the desired compound and isolate solid, Variations in Psychological Traits (PSCH 001), Expanding Family and Community (Nurs 306), American Politics and US Constitution (C963), Health Assessment Of Individuals Across The Lifespan (NUR 3065L), Leadership and Management in Nursing (NUR 4773), Creating and Managing Engaging Learning Environments (ELM-250), Professional Application in Service Learning I (LDR-461), Advanced Anatomy & Physiology for Health Professions (NUR 4904), Principles Of Environmental Science (ENV 100), Operating Systems 2 (proctored course) (CS 3307), Comparative Programming Languages (CS 4402), Business Core Capstone: An Integrated Application (D083), Lesson 6 Plate Tectonics Geology's Unifying Theory Part 2. Discussion: The melting point of the impure sulfanilamide was 153-158 degrees Crystallization is an equilibrium process and produces very pure material. % [5] Solubility: One gram of sulphanilamide dissolves in approximately 37 ml alcohol or in 5 ml acetone. That is why salt is added to make freezing mixtures to keep ice creams frozen. The melting points of the pure compounds were lower than the melting points of the impure substances. How can sodium chloride melt ice or keep it frozen? Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The first 5 pages are background explanation. Specifically in this From that we can conclude that methyl alcohol will be a good Answers/Comments are in blue ink. Depending on the quantity of impurity, the system may have progressed far from the eutectic temperature (perhaps to point b in Figure 6.7b) before liquid becomes visible to the eye. The pH of a 0.5% aqueous solution of Sulfanilamide is 5.8 to 6.1. temperatures. |(B8)[IqZ/gR 1%Q,#>Z;SstBnHs.pY'(k8Vjl[h /0uO *~#PTdkTK0H[3XQ_R1QH`;JCV4:ZHzbx4S0vg),+3 Listed below are solubility-vs-temperature data for an organic substance A dissolved in water. Lets say you live in an environment where the temperature in the winter is -10 C. for the crystallization of an impure sample of or. It has a max of 255 and 312nm. In order for the ice to melt it needs heat. A more impure solid may first visibly melt at perhaps point d in Figure 6.9b, to give a broader melting range (between points d and e). it at room temperature. experimental procedure for determining which one of three possible solvents is the most The melting point of a substance is often used to determine purity. D! The general technique involves dissolving the material to be crystallized in a hot solvent and cooling the solution slowly. Effect of impurities on melting point. Once the minor component is completely dissolved, further melting continues of the bulk component. 166 C) to be different if the 5% impurity were trans-cinnamic acid (MP 133 C) instead of fluorenone? In There's no question that your feet would have more contact with the water than the solid rocks, so your feet would be more damaged by the water (water at $180$ or $\pu{200 F}$ WILL burn you). X`I%&/m{JJt`$@iG#)*eVe]f@{{;N'?\fdlJ!?~|? Source: https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Organic_Chemistry_Lab_Techniques_(Nichols)/06%3A_Miscellaneous_Techniques/6.01%3A_Melting_Point/6.1C%3A__Melting_Point_Theory. This is a 10th-grade question. In conclusion, less energy is needed to break the forces of attraction and to destroy the crystalline structure. Sulfanilamide (also spelled sulphanilamide) is a sulfonamide antibacterial drug. sol Melting Point/Range 163 - 167 C / 325.4 - 332.6 F Boiling Point/Range No information available Flash Point No information available 5 0 obj solubility at lower temperatures and will separate from the solution as it is cooled. Using the melting machine it was found that impure sulfanilamide had a melting point of 172 C and pure sulfanilamide had a melting point of 165.1 C. When comparing the boiling point of sulfanilamide to the actual boiling point (165-166 C) the experiment was right on. solubility that occurred due to diffusion of the solvent will allow crystallization of the Ref: Hansch,C et al. The melting point of a compound is a measure of its purity. melting point technique was also utilized to determine the purity of the pure sample of both By comparing the solubility of impure fluorene in the 3 solvents in room, temperature and in a hot water bath, the best solvent for the crystallization of im, 0.519 g was collected, with a 69.57% recovery of sulfanilamide as shown in, Crystallization is a method of separation centered on the reduced solubili, a certain solvent at a specific temperature or pressure. A sufficient change in temperature that ultimately Sulfanilamide is a sulfa drug which is When a compound is impure, the presence of impurities disrupts the repeating pattern of the molecules, resulting in weaker intermolecular forces and a lower melting point. 4 0 obj Connect and share knowledge within a single location that is structured and easy to search. 2, 122 Corrosiv nonhazard O Urea Water or Hexane NH 2 O H 2 N 5. { "6.1A:_Overview_of_Melting_Point" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "6.1B:_Uses_of_Melting_Points" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "6.1C:__Melting_Point_Theory" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "6.1D:__Step-by-Step_Procedures_for_Melting_Point_Determination" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "6.1E:_Mixed_Melting_Points" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, { "6.01:_Melting_Point" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "6.02:_Boiling_Point" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "6.03:_Sublimation" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "6.04:_Chemical_Tests" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, [ "article:topic", "eutectic point", "eutectics", "freezing point depression", "authorname:nicholsl", "eutectic composition", "showtoc:no", "license:ccbyncnd", "licenseversion:40", "source@https://organiclabtechniques.weebly.com/" ], https://chem.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fchem.libretexts.org%2FBookshelves%2FOrganic_Chemistry%2FOrganic_Chemistry_Lab_Techniques_(Nichols)%2F06%253A_Miscellaneous_Techniques%2F6.01%253A_Melting_Point%2F6.1C%253A__Melting_Point_Theory, $ \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}$ $ \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} $$\newcommand{\id}{\mathrm{id}}$ $ \newcommand{\Span}{\mathrm{span}}$ $ \newcommand{\kernel}{\mathrm{null}\,}$ $ \newcommand{\range}{\mathrm{range}\,}$ $ \newcommand{\RealPart}{\mathrm{Re}}$ $ \newcommand{\ImaginaryPart}{\mathrm{Im}}$ $ \newcommand{\Argument}{\mathrm{Arg}}$ $ \newcommand{\norm}[1]{\| #1 \|}$ $ \newcommand{\inner}[2]{\langle #1, #2 \rangle}$ $ \newcommand{\Span}{\mathrm{span}}$ $\newcommand{\id}{\mathrm{id}}$ $ \newcommand{\Span}{\mathrm{span}}$ $ \newcommand{\kernel}{\mathrm{null}\,}$ $ \newcommand{\range}{\mathrm{range}\,}$ $ \newcommand{\RealPart}{\mathrm{Re}}$ $ \newcommand{\ImaginaryPart}{\mathrm{Im}}$ $ \newcommand{\Argument}{\mathrm{Arg}}$ $ \newcommand{\norm}[1]{\| #1 \|}$ $ \newcommand{\inner}[2]{\langle #1, #2 \rangle}$ $ \newcommand{\Span}{\mathrm{span}}$$\newcommand{\AA}{\unicode[.8,0]{x212B}}$, 6.1D: Step-by-Step Procedures for Melting Point Determination, Melting Point Depression (Lowering the M. P.), source@https://organiclabtechniques.weebly.com/, status page at https://status.libretexts.org. Crystallization of Impure Compounds and Classification of Unknown by Melting Point Results and Discussion In this experiment, crystallization was conducted to purify an impure sample of sulfanilamide using a known solvent, 95% ethyl alcohol, and melting point technique was utilized to verify the purity of the final material.
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