You can make asoluble salt by reacting an acid that contains one of the ions you want in the salt with an insoluble base that contains the other ion you need.
Method...
1. Start by heating the acid in a water bath - this speeds up the reaction.
2. Then add the base to the acid - the base and acid will react to produce a soluble salt (and water). You will know when the base is in excess and all the acid has been neutralised because the excess solid will just sink to the bottom of the flask.
3. Filter off the excess solid to get a solution containing only the salt and water.
4. Heat the solution gently, using a Bunsen burner, to slowly evaporate off some of the water. Leave the solution to cool and allow the salt to crystallise. Filter off the solid salt and leave it to dry.
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