Neutralization (chemistry)

Animation of a strong acid–strong base neutralization titration (using phenolphthalein). The equivalence point is marked in red.

In chemistry, neutralization or neutralisation (see spelling differences) is a chemical reaction in which acid and a base react with an equivalent quantity of each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution. The pH of the neutralized solution depends on the acid strength of the reactants.