MHT CET Chemistry question

The of acetylsalicylic acid (aspirin) is 3.5. The pH of gastric juice in human stomach is about 2-3 and the pH in the small intestine is about 8. Aspirin will be

(A)unionized in the small intestine and in the stomach
(B)completely ionized in the small intestine and in the stomach
(C)ionised in the stomach and almost unionized in the small intestine
(D)ionised in the small intestine and almost unionized in the stomachCorrect

Answer: (D)

Solution

In the stomach pH < , so the weak acid stays largely unionised (common-ion suppression); in the small

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Question ID VK-059084