What ions are present in solution after aqueous solutions of Cu(NO3)2 and K2S are mixed? Assume we mixed stoichiometric equivalent amounts of both reactants and 100% reaction.
a) Cu2+, NO3-, K+, S2-
b) Cu2+, S2-
c) No ions are present as both products form precipitates.
d) K+, NO3-
Answer: d) K+, NO3-