Example of a reaction in which change of state and formation of precipitate occur simultaneously
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Solution
One important class of chemical reactions is precipitation reactions. In such reactions, two different soluble salts (which are in aqueous solutions) combine to form two products.
One of these products is insoluble in the solution and is precipitated out (and is, therefore, referred to as the 'precipitate').
The example of precipitate reaction is as follows:
An aqueous solution of potassium chloride KCl reacts with silver nitrate AgNO3 solution an insoluble AgCl forms as a white substance.