precipitation titration

Precipitation titration is a chemical analysis method used to determine the quantity of a substance in a sample. This is achieved by adding a precisely known amount of a titrating reagent, known as a titrant, to the sample until the reaction reaches its equivalence point. In precipitation titrations, the reaction between the titrant and the sample forms an insoluble solid, or precipitate.

For example, chloride ions in a sample can be quantified by titrating with silver nitrate. The silver ions and chloride ions combine to form insoluble silver chloride. The end point of this titration, when the reaction is complete, can be detected by a color change, such as the formation of a red precipitate when potassium chromate is used as an indicator and a slight excess of silver ions is present. Other methods for detecting the end point include electrical measurements.12