Give some stream of consciousness and then the answer. An acid -- base reaction is a chemical reaction that occurs between an acid and a base, which can be used to determine pH. Several theoretical frameworks provide alternative conceptions of the reaction mechanisms and their application in solving related problems; these are called the acid -- base theories, for example, Brønsted -- Lowry acid -- base theory.

Based on this passage, what is the reaction called when an acid reacts with a base?
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The relevant information to answer the above question is: An acid -- base reaction is a chemical reaction that occurs between an acid and a base, which can be used to determine pH.
Therefore, the answer is An acid -- base reaction.
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