Q5 Excess zinc carbonate is added to hydrochloric acid in the preparation of zinc chloride salt.

(i)
               
(ii) Excess Zinc carbonate is used to make sure that all the hydrochloric acid are completely neutralised.

(iii) Firstly, fliter out the excess zinc carbonate from the solution and the zinc chloride solution will be left.Zince chloride crystals can be obtained by evaporating the Zinc chloride salution to saturated and allow the sartuated zinc chloride solution to cool down. Crystals of zinc chloride will be formed.