1) Solid lead acetate is slowly added to 50.0 mL of a 0.0486 M potassium hydroxide solution. The concentration of lead ion required to just initiate precipitation is _____ M.
2) Solid sodium carbonate is slowly added to 125 mL of a 0.0406 M zinc nitrate solution. The concentration of carbonate ion required to just initiate precipitation is ______ M.
1)
Pb(OH)2 -----------------> Pb2+ + 2OH-
Ksp = [Pb2+][OH-]^2
1.43 x 10^-20 = [Pb2+] (0.0486)^2
[Pb2+] = 6.05 x 10^-18 M
2)
ZnCO3 --------------> Zn2+ + CO32-
Ksp = [Zn2+][CO32-]
1.46 x 10^-10 = 0.0406 [CO32-]
[CO32-] = 3.60 x 10^-9 M
1) Solid lead acetate is slowly added to 50.0 mL of a 0.0486 M potassium hydroxide...
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