Soluble salts can be made by reacting an acid with a metal or an insoluble base (an oxide or hydroxide). The right acids and metal/insoluble base need to be selected to make the salt that you want.
Eg. If you wanted to make copper chloride, you'd mix hydrochloric acid (acid) with copper oxide (insoluble base)
To make the salt, you need to add the metal/insoluble base to the acid. The solid should dissolve in the acid as it reacts, and when excess solid startes to appear at the bottom, the acid has been neutralised.
The excess can then be filtered out, leaving you with a salt solution.
To get pure crystals of the salt, you need to evaporate the solution. This part is called crystallisation.
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