Chapter 1: Chemical reactions and equations

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Q
Chemical reactions and equations

Question:

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

Answer:

A precipitation reaction is the type of chemical reaction in which the formation of an insoluble solid (called precipitate) takes place, that separates from the solution. For example, when silver nitrate reacts with calcium chloride, a white precipitate of silver chloride is formed along with the aqueous solution of calcium nitrate.

2AgNO3 (aq) + CaCl2 (aq) → 2AgCl (s) + Ca(NO3)2 (aq)

Similarly, a white precipitate of barium sulphate is formed when sodium sulphate reacts with barium chloride.

Na2SO4 (aq) + BaCl2 (aq) → 2 NaCl (aq) + BaSO4 (s)


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