4.8 describe experiments to prepare insoluble salts using precipitation reactions

You can use a precipitation reaction. To do this just pick two solutions that contains the ions you need and add them together. For example, to make barium sulfate (insoluble) you need to add together one solution containing barium ions and another containing sulphate ions. To do this, you cam mix barium chloride with sulphuric acid...

barium chloride + sulphuric acid ---> barium sulphate + hydrochloric acid

BaCl_2(aq) + H₂SO_4(aq) ---> BaSO_4(s) + 2HCl_(aq)