Q1 Zinc nitrate reacts with aqueous ammonia (NH4OH) to form a salt and a base.

(i) Name the salt and the base.

Answer: The salt is ammonium nitrate and the base is zinc hydroxide.

(ii) Describe the observations for the reaction.

Answer: White precipitate of zinc hydroxide will be form with ammonium hydroxide. This precipitate will dissolve in excess aqueous ammonia to form complex zinc ion, which give you a colourless solution.

(iii) Write a chemical equation for the reaction (include state symbols).

Answer:

Zn(NO3)2(aq) + 2NH4OH (aq) --> Zn(OH)2 (s) + 2NH4NO3 (aq)

(iv) Write an ionic equation for the reaction.

Answer:

Zn²⁺ (aq) + 2OH^- (aq) --> Zn(OH)2 (S)