Question

From the list of substances given, name the substance which you would use to prepare each of the following salts, named in parts (a) to (d):

The substances are Copper, Lead, Sodium, Zinc, Copper oxide, Lead carbonate solution, dilute Hydrochloric acid, dilute Nitric acid and dilute Sulphuric acid:

(a) Zinc sulphate

Answer 1

Displacement reaction:

A displacement reaction is a chemical reaction in which a more reactive element can displace a less reactive element.

Preparation of Zinc sulfate:

Material used:

• Zinc $\left(\mathrm{Zn}\left(\mathrm{s}\right)\right)$
• Dilute Sulfuric acid $\left({\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)\right)$

Preparation:

• When Zinc $\left(\mathrm{Zn}\left(\mathrm{s}\right)\right)$ reacts with dilute Sulfuric acid $\left({\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)\right)$, Zinc sulfate $\left({\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)\right)$ forms along with the liberation of hydrogen gas $\left({\mathrm{H}}_2\left(\mathrm{g}\right)\right)$.
• This is a displacement reaction.
• The chemical reaction is as follows:

$\mathrm{Zn}\left(\mathrm{s}\right)+\mathrm{dil}.{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)\to {\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$