Calculate the molar solubility of lead thiocyanate in pure w

Calculate the molar solubility of lead thiocyanate in pure water. The molar solubility is the maximum amount of lead thiocyanate the solution can hold. convert it to M.

Solution

Pb(SCN)2 <==> Pb^2+ + 2 (SCN)^-
. . s . . . . . . . . . .. . s . . . . . . 2s

KSCN -------------> K+ + SCN-
0.600 . . . . . . . . . . . . . . . 0.600

Ksp = [Pb^2+][CN^-]^2
2.00 10^-5 = (s)(2s+0.600)^2
s = 5.55 10^-5

the molar solubility of lead thiocyanate in 0.600M KSCN = 5.55 10^-5 mol/L