1. Soluble salts can be made by the neutralisation of an acid by a base. Insoluble salts can be made by precipitation. (a) The following is a brief description of the preparation of the soluble salt, nickel(II) chloride-6-water, from the insoluble base nickel(II) carbonate. Nickel(II) carbonate is added in small amounts to hot dilute hydrochloric acid until it is in excess. The mixture is filtered. The filtrate is partially evaporated and then allowed to cool until crystals of nickel(II) chloride-6-water form. (i) Why is it necessary to use excess carbonate?
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It is necessary to use exess carbonate so that the whole thing is reacted .
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