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Exam 2
Exam 2
23
Chemistry
Undergraduate 2
03/30/2014
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Term
Acetic acid and methyl formate are constitutional isomers. Both are liquids at room temp: one has a BP of 32C and the other 118C. Which one has a higher BP and why?
 Definition
Acetic acid is higher because it forms hydrogen bonds dimers.
Term
The pH of human gastric juice is normally in the range of 1 to 3. What form of lactic acid (pKa = 4.07) would you expect to be present in the stomach, lactic acid or its anion? Explain.
 Definition
The acid form RCOOH. At pKa 4.07, you have more equal amounts of RCOOH and RCOO-. When it is in a more acidic solition (pH ~2), all the RCOO- reacts with H+ to make RCOOH
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