The pK a of acetylsalicylic acid (aspirin) is 3.5 . The pH of gastric juice in human…

Chemistry · JEE Advanced · NTA ExamsEquilibrium

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 small intestine is about 8. Aspirin will be :
  1. unionised in the small intestine and in the stomach
  2. completely ionized in the small intestine and in the stomach
  3. ionised in the stomach and almost unionised in the small intestine
  4. ionised in the small intestine and almost unionised in the stomach

Answer

(D) ionised in the small intestine and almost unionised in the stomach

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