The solubility of iron(III)hydroxide is 4.39E-10M. What is the Ksp for this compound? I don't know how I would go about this problem.

Answer 1

...........Fe(OH)3 ==> Fe^3+ + 3OH^-
I...........solid......0........0
C......x dissolves.....x........3x
E...........solid......x........3x
The problem tells you that x = 4.39E-10M = (Fe^3+).
Therefore, 3x = 3*4.39E-10M = (OH^-)
Then Ksp = (Fe^3+)(OH^-)^3 = substitute and solve for Ksp.

Answer 2

1.52x10^64