COMEDK2013ChemistryChemistry in Everyday Life
The pH value of gastric juice in human stomach is about 1.8 and in the small intestine it is about 7.8 . The p K_ a value of aspirin is 3.5 . Aspirin will be
Options
- Acompletely ionised in the small intestine and in the stomach
- Bunionised in the small intestine and in the stomach
- Cionised in the small intestine and almost unionised in the stomach
- Dionised in the stomach and almost unionised in the small intestine
Correct answer
D. ionised in the stomach and almost unionised in the small intestine
Step-by-step solution
Aspirin is an acidic compound. It will not dissociate in acidic medium i.e., small intestine in order to react with base but will dissociate in basic medium.