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Titrations are a common laboratory technique used to determine the concentration of a known reactant based on its reaction with a known volume of a second reactant. The endpoint is often determined using an indicator which changes color based on the pH of the solution. Titrations are commonly used to determine the concentration of an unknown acid or base, but they can also be used to determine the concentration of other reactants such as oxidizing or reducing agents or the amount of metals in a sample.