Question

Write a chemical equation when Zn granules react with
a) sulphuric acid
b) hydrochloric acid
c)sodium hydroxide

Answer 1

Zn(s)+ H2SO4(aq.) = ZnSo4 (aq.)+ H2(↑)

2Zn (s)+2HCl( aq.)= 2ZnCl(aq.) + H2(↑)

Zn (s)+ NaOH(aq.) = Zn(s)+ NaOH(aq.) (no reaction since sodium is more reactive than zinc ).

Answer 2

Chemical equation for reaction of Zinc granules with Sulfuric acid, HCl and Sodium hydroxide.

a) Reaction of Zinc granules with Sulfuric acid

• When metal zinc reacts with acid such as sulfuric acid, product is formed by single displacement reaction.
• The hydrogen from sulfuric acid is replaced by Zinc.
• The equation involved in the reaction is as follows:

$Zn+H_2SO_4\rightarrow ZnSO_4+2H$

b) Reaction of zinc granules with HCl

• When metal zinc reacts with acid such as hydrochloric acid, product is formed by single displacement reaction.
• The hydrogen from Hydrochloric acid is replaced by Zinc.
• The equation involved in the reaction is as follows:

$Zn+2HCl\rightarrow ZnCl_2+H_2$

c) Reaction of zinc granules with sodium hydroxide

• When metal zinc reacts with base such as sodium hydroxide,it forms oxide.
• The equation involved in the reaction is as follows:

$Zn+2NaOH\rightarrow Na_2ZnO_2+H_2$

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