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

Options

A. ionised in the small intestine and almost unionised in the stomach
B. unionised in the small intestine and in the stomach
C. completelyl ionised in the small intestine and in the stomach
D. ionised in the stomach and almost unionised in the amall intestine

Answer

A

Explanation

Aspirin is a moderate acid (`pk_(a) = 3.5 `) hence it is almost unionised in stomach due to its strong acidie medium because of HCl. It is due to common ion effect while in small intestine, the medium is alkaline, hence aspirin will be sufficiently ionised in small intestine.