Question 15:

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

Answer

A reaction in which an insoluble solid (called precipitate) is formed is called a

precipitation reaction.

For example:

Na₂CO_3(aq)   +  CaCl_2(aq)   →   CaCO_3(s) +   2NaCl_(aq)

Sodium           Calcium          Calcium         Sodium

carbonate       chloride          carbonate       chloride

In this reaction, calcium carbonate is obtained as a precipitate. Hence, it is

a precipitation reaction.

Another example of precipitation reaction is:

Na₂SO_4(aq) +   BaCl_2(aq)  →   BaSO_4(s) +   2NaCl_(aq)

Sodium           Barium          Barium         Sodium

Sulphate        chloride         sulphate        chloride

In this reaction, barium sulphate is obtained as a precipitate.

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