The pKa of acetylsalicylic acid (aspirin) is 3.5 The pH of gastric juice in human stomach is about 2−3 and the pH in the same intestine is about 8. Aspirin will be
A
Unionised in the small intestine and in the stomach
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B
Completely ionised in the small intestine and in the stomach
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C
Ionised in the stomach and almost unionised in the samll intestine
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D
Ionised in small intestine and almost unionised in the stomach
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Solution
The correct option is D Ionised in small intestine and almost unionised in the stomach
Aspirin (acetylsalicylic acid) is a weak acid.
So in the acidic pH of the stomach it will be in an unionised form.
In the alkaline pH of the intestine it will be in ionised form.