usLVING: SHOW ALL SOLUTIONS FINAL ANSWER TO PROPER L. Acetylsalicylic acid (a.k.

Question

usLVING: SHOW ALL SOLUTIONS FINAL ANSWER TO PROPER L. Acetylsalicylic acid (a.k.a. aspirin disease and prevent thrombosis, and this da mote than st aa sable cataracts, and senile dementias and this dnus hore thantaainkilerie reatment o just a pain killer, it is said to ward off heart as a possible treatment of cancer, OF SCNS TO GET FULL CREDITS (ROUND OFF SIGNIFICANT FIGURES) ug has been mooted beea pos -OH Ka 3.16 x 10-4 O-C-CH -CH,+H 7Acetylsalicylic acid (aspirin) HA acetylsalicylate A. (10 points) What is the ph of a solution containing 0.255 M of aspini 8 0255 M of aspirin, HA? LA 3.ILx(o B. (10 points) what is the % of the drug that is dissociated [%%) and the % that 0.255 M solution of aspirin? is associated [% HA ] in a

Explanation / Answer

HA --> H+ + A-

(0.225 – x) --> x + x

Ka = 3.16 x 10-4 = x2 / (0.225 – x)

a)

Assume x << 0.225

x2 = 0.225 * 3.16 x 10-4

x2 = 7.11 x 10-5

x = 8.4 x 10-3 M

[H+] = x = 8.4 x 10-3 M

pH = -log([H+]) = 2.08

b)

% dissociated [A-] = x / 0.225 * 100

= 3.7 %

% associated [HA] = 100 – 3.7 %

= 96.3 %

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