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Safari File Edit View History Bookmarks Window Help R 68%, Sat 12:41 PM Q mycourses.purdue.edu Shopping Bag https://mycourses.purdue.edu/bbcswebdawpid-10227136-dt-conten... Chegg Study Guided Solutions and Study Help | Chegg.com PRE-LAB QUESTIONS - WEEK2 o 10 1. One can react glycerol and myristic acid to make trimyristin. For glycerol, myristic acid, and trimyristin, list the unique functional group each of these substances possesses, and then list the corresponding peaks for that group that would show up ir an infrared spectrum of the material. Be sure to use your results from the IR Tutor assignment, Zubrick, and the Table of IR Absorptions and Interpretation Guide in the Introduction of this Manual. IM HM 116 2. What are two reasons that organic chemists measure the melting points of solids? 3. If the melting point for an unknown compound is the same as that for a known TATS compound (determined under identical conditions), is it possible to conclude that the two compounds are the same, assuming you have no other data? Explain your reasoning COM 11 PROCEDURE-WEEK1

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2: The purpose of melting point determination is to identify the unkonwn compounds. By taking the unknown solid melting point we can compare it to list of potential solids and their melting point and make a match to identify the solid.

The another purpose of a melting point determination is to estimate the general purity of the unknown compounds, compounds with smaller melting point range is like more in its purity. For a material whose identity is known , an estimate of degree of purity can be made by comparing its melting point with that of a pure sample.

3: Usually crystalline organic compounds are having sharp melting point. Let's assume Unknown compound 'X' is suspected of being identical to some known compound 'A' . If the two are identical , they should have the same melting point. If X and A are identical its mixture also should have same melting point like alone compound, but it may not in all yhe cases. If the two compounds is having same Melting point it may vary with its structure and chemical properties, Thus if A is reported in the chemical litterature to have a melting point significantly different from that observed for 'X' we can be quite certain that X does not have the same structure as A.

So we cannot conclude purity or identification test only by considering melting point, we are having lot of chromatographic and spectrographic techniques like HPLC, GC , IR , UV like this. From this Techniques we can get accurate properties and purity of unknown compounds.

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