Three solutions are mixed together to form a single solution. One contains 0.2 m

Question

Three solutions are mixed together to form a single solution. One contains 0.2 mol Pb(CH3COO)2 , the second contains 0.1 Na2S, and the third contains 0.1 CaCl2 . (a) Write the net ionic equations for the precipitation reaction or reactions that occur. (b) What are the spectator ions in the solution?

Explanation / Answer

a) Pb2+ + S2- ---> PbS (s) ; Pb2+ + 2Cl- ---> PbCl2 (s) ; Ca2+ + S2- ---> CaS (s) ; Note : CaS is only partially soluble in water thus it will form only small amount of precipitate. b) spectator ions are Na+ and CH3COO- .

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