What do you mean by a precipitation reaction? Explain by giving examples.

The reaction which is accompanied by the formation of an insoluble solid mass which is also called as precipitate is known as precipitation reaction.

For example

When Barium Chloride solution is added to an aqueous  solution of sodium sulphate, a white precipitate of Barium sulphate is obtained.

Bacl2 (aq) + Na2SO4(aq)¬† —BaSO4 (s) (white precipitate) + 2NaCl (aq)

Barium sulphate precipitate.

When silver nitrate is added to an aqueous solution of sodium chloride, a white precipitate of silver chloride(AgCl), which is soluble in NH4OH is obtained

 

AgNO3 aq) + NaCl (aq) —— AgCl (s) ( white precipitate) + NaNO3 (aq)

Silver chloride precipitate.

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