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Chrome File Edit View History Bookmarks People Window Help 100% Mon 1:07 PM EE XE Behind the confession: Relax D Quinnipiac University Libr x D Amino Acids with pKa's x The NoSleep Podcast I No x Zachary C Chegg.com Quinnipiac University CH ning.com, 2500091 Apps Bookmarks 3 Google calendar w lab 1 Breakover Jay M McGraw-Hill Connec D Tickets Boston cal O Your 2014 opening e Programmed Cell De uestion T5OTT5 Due Date: Map 100 Late submissions: sapling learning Nicolas Carrasco atQuinnipiac University 100 sume that you are having a bad migraine headache and you take a 500 mg tablet of aspirin with a glass T orange juice. The pH of your stomach is 2. Please answer the following questions. Assume that aspirin has a pka of 4. (Don't include the sign in the answers below.) 80 A) Percentage of aspirin that can be absorbed by the body Points Possible 98 Grade Category: 100 Description: B) Percentage of aspirin that carries a negative charge. This homework assig chapter on amino ac 100 is assigned as a polar hydroxyl group in the C) Percentage of aspirin that is neutral. 100 Policies 93 You can check your ar D) Percentage of aspirin that is water-soluble. 67 You can view solution 100 up on any question. E) Percentage of aspirin that is fat-soluble. You can keep trying t 100 you get it right or giv 100 You lose 10% of the p answer in your questi 100 at that answer O Previous Give Up & View Solution 2 Check Answer O Next Exit O Help With This Top

Explanation / Answer

pKa = 4

-log(Ka) =4

Ka = 10-4 mol/L

Moles of aspirin added (N) = 0.5/180 = 0.0028 mol

pH = 2 = -log([H+])

[H+] = 10-2 mol/L

HAs ---------------> As- + H+

N - x x 10-2 mol/L

Ka = x.10-2 / (N - x) = 10-4

x / (0.0028 - x) = 10-2

x = 2.75 x 10-5 mol

A) % aspirin absorbed that can be absorbed by body = (N-x)/N *100 99

B) % aspirin that carries a negative charge = x/N *100 1

C) % aspirin that is neutral = (N-x)/N *100 99

D) % aspirin that is water soluble = % aspirin ionized

= x/N *100 1

E) % aspirin that is fat soluble = % aspirin that is neutral

99

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