Reactions that produce a precipitate can be classified as precipitation reactions. In these chemical reactions, two soluble reactants in aqueous solution combine to form an insoluble solid (the precipitate) and a new solution. The formation of the precipitate is often a clear indicator of a chemical change. Common examples include the reaction of silver nitrate with sodium chloride, resulting in the formation of silver chloride as a white precipitate. Precipitation reactions play a crucial role in analytical chemistry, qualitative analysis, and selective precipitation techniques, providing a means to identify and separate specific ions or compounds based on their solubility characteristics.