At 25 °C only 0.0580 mol of the generic salt AB3 is soluble in 1.00 L of water. What is the Ksp of the salt at 25 °C?

Answer 1

........AB3 ==> A^3+ + 3B^-
.........x.......x.......3x
x = 0.0580 = (A^3+)
3x = 3*0.0580 = (B^-)
Ksp = (A^3+)(B^-)^3
Ksp = (0.0580)(3*0.0580)^3 = ?

Answer 2

At 25 °C only 0.0390 mol of the generic salt AB3 is soluble in 1.00 L of water. What is the Ksp of the salt at 25 °C?