pH = 10.21 pOH = 14-10.21=3.79 [OH-] = 10-pOH = 1.622x10-4 M [M2+] = 0.5[OH-] = 8.11x10-5 M Ksp = [M2+][OH-]2 Ksp = 2.133x10-12 Solution pH = 10.21 pOH = 14-10.21=3.79 [OH-] = 10-pOH = 1.622x10-4 M [M2+] = 0.5[OH-] = 8.11x10-5 M Ksp = [M2+][OH-]2 Ksp = 2.133x10-12.