Write the chemical equation for the identification of ammonium ion using sodium hydroxide solution.

State one relevant observation for of the following:

Lead nitrate solution is treated with sodium hydroxide solution dropwise till it is in excess.

Distinguish between the following pair of compounds using the reagent given in the bracket.

Ferrous sulphate solution and ferric sulphate solution. (using sodium hydroxide solution)

Ammonium nitrate (${\mathrm{NH}}_4{\mathrm{NO}}_3$) is an important fertiliser. The ions in it can be identified by tests. Suggest if the given tests will confirm the presence of ions?

TEST: When aqueous sodium hydroxide is added to a solution of the compound, a white precipitate forms. This does not dissolve in excess sodium hydroxide. 

Ammonium nitrate (${\mathrm{NH}}_4{\mathrm{NO}}_3$) is an important fertiliser. The ions in it can be identified by tests. Suggest if the given tests will confirm the presence of ions?

TEST: On heating the solid with solid sodium hydroxide, a gas is given off. It turns damp red litmus paper blue.

• Ammonia turns red litmus paper blue.

Ammonium nitrate (${\mathrm{NH}}_4{\mathrm{NO}}_3$) is an important fertiliser. The ions in it can be identified by tests. Suggest if the given tests will confirm the presence of ions?

TEST: On heating, the solid with dilute sodium hydroxide, a gas is given off. It turns damp blue litmus paper red.

Complete the following reaction:

${\mathrm{NH}}_4\mathrm{Cl}+\mathrm{NaOH}\stackrel{∆}{\to }$