Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Problem:Passage: Perhaps you have eaten too much pizza and felt very uncomfortable hours later. This feeling is due to excess stomach acid being produced. The discomfort can be dealt with by taking an antacid. The base in the antacid will react with the HCl in the stomach and neutralize it, taking care of that unpleasant feeling. Answer: neutralize it
Solution:
The base in an antacid reacts to do what to excess stomach acid?