1.

What is meant by precipitation reaction ? Explain it with examples.

Answer»

Solution :CHEMICAL reaction in which an insoluble PRECIPITATE (solid) formed is known as precipitation reaction.
For EXAMPLE, reaction between `Ba^(2)` ions 2- of `BaCl_(2)`, and `SO_(4)^(2-)` ions of `Na_(2)SO_(4)` gives white precipitate of `BaSO_(4)`, which is insoluble in water.
`BaCl_(2)(aq)+ Na_(2)SO_(4)(aq) to underset("White precipitate")(BaSO_(4)(s))+2NaCl(aq)`
Other example :
`AgNO_(3)(aq)+NaCl(aq) to underset("White precipitate") (AgCl(s))+ NaNO_(3)(aq)`


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