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The pH value of gasfric juice in humna s...

The pH value of gasfric juice in humna stomach is about 1.8 and in intiestine , it is about 7.8. The `pk_(a)` value of aspirin is 3.5 Aspirin will be

A

Ionised in the small intestine and stom

B

Ionised in the stomach and almost unionized in the small intestine

C

Unionised in small intestine and stomach

D

Completely ionized in small intestine and stomach

Text Solution

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The correct Answer is:
A
Aspirin is a moderate acid `( pK _(a) = 3. 5).` Therefore, it is almost unionized in stomach due to its strong acidic medium. It happens due to common ion effect. On the other hand, in small intestine, the medium is alkaline, hence, aspirin will be sufficiently ionized in it.
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