When a solution of Cu(II) chloride, CuCl2 , is added to a solution of potassium sulfide, K2S, a black precipitate of copper sulfide, CuS, forms. Which of the following is the molecular equation for this reaction?
A) CuCl2(aq) + K2S(aq) ? CuS(s) + 2 KCl(aq)
B) Cu2+(aq) + Cl22-(aq) + K22+(aq) + S2-(aq) ? CuS(s) + K22+(aq) + Cl22-(aq)
C) Cu2+(aq) + 2 Cl-(aq) + 2 K+(aq) + S2-(aq) ? CuS(s) + 2 K+(aq) + 2 Cl- (aq)
D) Cu2+(aq) + S2-(aq) ? CuS(s)
A
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