Question:
What happens when a piece of
(a) zinc metal is added to copper sulphate solution ?
(b) aluminium metal is added to dilute hydrochloric acid ?
(c) silver metal is added to copper sulphate solution ?
Also write the balanced chemical equation if the reaction occurs.
Solution:
(a) Metal zinc displaces hydrogen component on reacting with dilute sulphuric acid (H2SO4) as H2 gas which is evolved
Zn(s) + H2SO2(aq) ———-> ZnSO4(aq) + H2(g)
(b) Ammonia and hydrogen chloride gas. When vapours of ammonia and hydrogen chloride gas are mixed, the compound formed is ammonium
chloride. It is a white solid.
NH3(g) + HCl(g) ———-> NH4Cl (s)
(c) Copper displaces silver from the aqueous solution of silver nitrate.
Cu(s) + 2AgNO3(aq) ——–> Cu(NO3)2(aq) + 2Ag(s)