A solution contains 0.11 M sodium chloride and 0.11 M potassium fluoride. Solid lead nitrate is...
A solution contains 0.11 M sodium chloride and 0.11 M potassium fluoride. Solid lead nitrate is added slowly to this mixture. What ionic compound precipitates first from the solution? Solubility product constant data is found in the Chemistry References.
Homework Answers
[Pb2+] = Ksp (PbCl2)/[Cl-]2 = 1.7×10-5/(0.11M)2
= 1.405×10-3 M = minimum concentration of Pb2+ require to precipitate PbCl2
[Pb2+] = Ksp (PbF2)/[F-]2 = 2.05×10-8/(0.11M)2
= 1.69×10-6 M = minimum concentration of Pb2+ required to precipitate PbF2 .
Answer: PbF2 (lead (II) fluoride ) will precipitate first .
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