AB3 = A 3+ + 3B-
Ksp = [A3+] * [B-]^3
moles of AB3 that dissolved @ 25 = 1.70 g / 263 g/mol = 0.006464 moles
so [A3+] = 0.006464 g / mol
[A3-] = 0.0194
Ksp = 0.006464 * 0.0194 ^3
Ksp = 1.414 * 10 ^-07
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AB3 = A 3+ + 3B-
Ksp = [A3+] * [B-]^3
moles of AB3 that dissolved @ 25 = 1.70 g / 263 g/mol = 0.006464 moles
so [A3+] = 0.006464 g / mol
[A3-] = 0.0194
Ksp = 0.006464 * 0.0194 ^3
Ksp = 1.414 * 10 ^-07