Titration is a quantitative chemical analysis technique used to determine the concentration of an unknown solution by reacting it with a solution of known concentration. The known solution is called the titrant, and the unknown solution is called the analyte. The titration process involves adding the titrant to the analyte until the reaction between them is complete, as indicated by a change in color or other observable property.

The volume of titrant required to reach this endpoint is then used to calculate the concentration of the analyte using stoichiometry. Stoichiometry involves using the balanced chemical equation for the reaction between the titrant and analyte to determine the mole ratio between them. This mole ratio can then be used to calculate the concentration of the analyte based on the volume and concentration of the titrant used.

In summary, titration measures the volume of a titrant of known concentration required to react completely with a known volume of an analyte of unknown concentration. This measurement allows for the calculation of the concentration of the analyte based on the stoichiometry of the reaction between the titrant and analyte.