Titration is a laboratory procedure to find the concentration of a solution by reacting it with a standard solution.

In volumetric procedures, we measure volumes of reactants. Titration is usually performed as a volumetric procedure.

Titration usually is performed using a detection system called an indicator. A measured amount of one chemical is placed in a mixing chamber, usually an Erlenmeyer flask. The second chemical is added using some volume measuring procedure, often with a device called a buret. The addition continues, with constant mixing, until some signal is given that the reaction is 'over.' This stopping point is called the end point. An indicator indicates the end point. Indicators are chosen so as to make the end point of the titration close to some chemically understood point such as the equivalence point. The equivalence point occurs when exactly one equivalent of reactant has been added from the measuring device (buret, Beral pipet) for each equivalent present in the mixing chamber (flask, well. etc.)

It is revealing when possible to measure the concentration of some species during a titration. This is called a titration curve. For example, measuring [H⁺] as a function of the volume of titrant added during an acid-base titration. Most often we plot pH as a function of titrant volume. (Using appropiate measuring systems, it often is possible to follow the concentrations of various species. Titration curves are usually obtained for acid-base reactions using pH electrodes.)

Because acid-base chemistry is well understood, it also is possible to predict or calculate a titration curve given the various concentrations and equilibrium constants.