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9
9 PbCl2 Q > Ksp (PbCl2), Q = [Pb2+][Cl-]2. Pb2+ :
Pb(NO3)2 Pb2+ + 2NO3-C2 C2 2C2C1V1 = C2V2 0.065 20 = C2 35
C2 = 0.037 M
[Pb2+] = 0.037 M Cl- :
NaCl Na+ + Cl-C2 C2 C2C1V1 = C2V2 0.080 15 = C2 35
C2 = 0.034 M
[Cl-] = 0.034 MQ = [Pb2+][Cl-]2 = (0.037) (0.034)2 = 4.3 10-5. Ksp (PbCl2) = 1.6 10-5, Q > Ksp (PbCl2) PbCl2.