Question

How are the following salts prepared. Give balanced chemical equation?
(a) Calcium carbonate (insoluble) from calcium chloride
(b) Copper sulphate from copper hydroxide
(c) Zinc sulphate from sulphuric acid
(d) Ferric chloride from iron

Answer 1

(a) Calcium carbonate is prepared by treating calcium chloride with sodium carbonate.
$CaC{l}_2\left(aq\right)+N{a}_{2}C{O}_3\left(aq\right)\to CaC{O}_3\left(s\right)+2NaCl\left(aq\right)$ [1 Mark]

(b) Copper sulphate is obtained by the neutralisation of copper hydroxide and sulphuric acid.
$H_{2}S{O}_4\left(aq\right)+Cu\left(OH{)}_2\right(s)\to CuS{O}_4(s)+2H_{2}O(l)$
[1 Mark]

(c) Zinc sulphate is obtained by treating metal zinc with sulphuric acid.
$Zn\left(s\right)+H_{2}S{O}_4\left(aq\right)\to ZnS{O}_4\left(s\right)+H_2\left(g\right)$
[1 Mark]

(d) Ferric chloride is prepared by the combination of iron and chlorine.
$2Fe\left(s\right)+3C{l}_2\left(g\right)\to 2FeC{l}_3\left(s\right)$

[1 Mark]