A method of quantitatively determining the concentration of a solution. A standard solution (known concentration) is slowly added from a buret to a solution of the analyte (unknown concentration) until the reaction between them is judged to be complete (equivalence point). In colorimetric titration, some indicator must be used to locate the equivalence point. One example is the addition of acid to base using phenolphthalein (indicator)to turn a pink solution colorless in order to determine the concentration of unknown acids and bases.

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