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Safari File Edit View History Bookmarks Window Help R 28% G) Fri 3:15 PM Q E mycourses.purdue.edu After you have collected your data, discard the trimyristin in the TRIMYRISTIN WASTE JAR. DISCUSSiON QUESTIONS 1. Why was the whole nutmeg crushed and ground before it was extracted with dichloromethane? 2. Go online or to the Chemistry Library (see the Introduction/Table of Physical Constants for information on sources of chemical information) and look up the solubility of trimyristin in different solvents. Would water be a good solvent to extract trimyristin from nutmeg? Why or why not? 3. Describe how your melting point for the trimyristin compares with the known melting point for this compound. If they are different, explain why they different. 4. Were your IR spectra of trimyristin, glycerol, and myristic acid consistent with the peaks you proposed in Prelab Question #3 (Week 2)? If you synthesized trimyristin using the reaction on the first page of this experiment, would you be able to detect any of the starting materials or solvents in the product by IR? If so, which ones, and what characteristic peaks would show up in the IR spectrum?

Explanation / Answer

1) Because nutmeg powder was crushed used because its increased surface area would be exposed to the solvent and the extraction.

Trimyristin is found in nutmeg; is a triglyceride (a trimester consisting of a glycerol backbone with fatty acid groups [long chain carboxylic acids] from myristic acid)

2) Trimyristin is a tri-ester of the 14-carbon saturated fatty acid ,myristic acid, and glycerol. It has three long non-polar tails and a head containing three highly polar carboxyl groups joined with a hydroxy group in an ester linkage.tail of trimyristin non-polar, only non-polar solvents interact with the tails. i.e hexane, pet ether.

Rank solvents in order of which you'd extract the most trimyristin:

1.dicholormethane
2. deithyl ether
3. cyclohexane
4. acetone
5. methanol

3) melting point (the temperature at which a solid becomes a liquid at normal atm pressure.

Once trimyristin is isolated, its purity can be verified by its melting point.A pure sample melts at a high and sharp melting point and an impure one will melt at a lower and broad melting point; even through trimyristin and myristic acid have the same m.p., a mixture of the two is regarded as an impure sample.

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