Question

Give a balanced chemical equation in each case when-

i) Zinc oxide dissolves in sodium hydroxide.

ii) Zinc is heated with sodium hydroxide solution.

Answer 1

The balanced equations are as follows :

1. Zinc oxide dissolves in sodium hydroxide :

$\underset{Zincoxide}{Zn{O}_{\left(s\right)}}+\underset{SodiumHydroxide}{2NaO{H}_{(aq.)}}\to \underset{SodiumZincate}{N{a}_{2}Zn{O}_{2(aq.)}}+\underset{Water}{H_2{O}_{\left(l\right)}}$

2. Zinc is heated with sodium hydroxide solution :

$\underset{Zinc}{Z{n}_{\left(s\right)}}+\underset{SodiumHydroxide}{2NaO{H}_{(aq.)}}\stackrel{Heat}{\to }\underset{Sodiumzincate}{N{a}_{2}Zn{O}_{2(aq.)}}+\underset{Hydrogen}{H_{2\left(g\right)}}$