Pharmacology pKa is the pH at which A There is 50% drug in active form B There is 50% ionized and 50% non-ionized fraction of the drug C All the drug is in non-ionized form D All the drug is in ionized form 💡 Explanation pKa is the pH at which ✓ Correct Answer: B. There is 50% ionized and 50% non-ionized fraction of the drug