Question

What do you understand about a precipitation reaction? Explain with an example.

Answer 1

Precipitation is a reaction in which two compounds in an aqueous state react to form an insoluble salt as one of the products. The insoluble salt formed is known as precipitate. Example: When ferrous sulphate solution is added to sodium hydroxide solution, a dirty green precipitate is formed. This is an example of a precipitation reaction That is,
$FeS{O}_4\left(aq\right)+2NaOH\left(aq\right)\to Fe(OH{)}_2\downarrow +N{a}_{2}S{O}_4(aq)$