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What Is the Concentration of [PbCl3]- when PbCl2 Solid First ⇌\rightleftharpoons

Question 20

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What is the concentration of [PbCl3]- when PbCl2 solid first begins to precipitate on addition of NaCl salt to a 0.5 M PbNO3 solution?
Pb2+ + 3Cl- ⇌\rightleftharpoons [PbCl3]-
Kf = 2.4 x 101pKsp(PbCl2) = 4.77

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