Step 1: The sodium sulfide solution is poured into the copper(II) sulfate soluti

Question

Step 1: The sodium sulfide solution is poured into the copper(II) sulfate solution. What (if any) precipitate forms?
Step 2: Barium chloride solution is poured into the Step 1 mixture. What (if any) precipitate forms?
Step 3: Lead(II) nitrate solution is poured into the Step 2 mixture. What (if any) precipitate forms? Solubility rules, a qualitative approach. A chemist prepares four beakers, each with exactly 1.0 M of a particular salt dissolved in water. In the reactions, assume complete formation of any solid products (ignore equilibrium).

Explanation / Answer

Step 1: The sodium sulfide solution is poured into the copper(II) sulfate solution. What (if any) precipitate forms?

Na2S(aq) + CuSO4(aq) --> CuS(s) + Na2SO4(aq)

CuS precipitate forms.

Step 2: Barium chloride solution is poured into the Step 1 mixture. What (if any) precipitate forms?

CuS(s) + 2Na + (aq) +    SO42-(aq) + Ba2+ (aq)+ 2Cl-(aq) -à CuS(s) +BaSO4(s) +2Na + (aq) +   2Cl-(aq) -

Step 3: Lead(II) nitrate solution is poured into the Step 2 mixture. What (if any) precipitate forms?

CuS(s) +BaSO4(s) +2Na + (aq) +   2Cl-(aq) - + + Pb^2+ + 2NO3^2 --- > CuS(s) +BaSO4(s) +2Na + (aq) +   + 2NO3^- + PbCl2(s)

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