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CuCl2(aq) + K2S(aq) --> CuS(s) + 2KCl(aq)

K and Cl are spectators so the net ionic would be:

Cu2+(aq) + S2-(aq) --> CuS(s)

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How can you make potassium chloride precipitate?

You can make potassium chloride precipitate by adding silver nitrate (AgNO3). The chemical equation being AgNO3(aq)+ KCl(aq) = KNO3(aq) + AgCl(s) You know that silver nitrate will form a precipitate as you can see this on a solubility chart.


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