If you are working a problem that asks you to find the solubility of Cr(OH)3 in water and you assign...?

If you are working a problem that asks you to find the solubility of Cr(OH)3 in water and you assign variables, what would be the coefficient of x for the variable assignment for OH–?

Answer:
The equilibrium is
Cr(OH)3 <> Cr3+ + 3OH-
and the requirement for this equilibrium is that
Ksp = [Cr3+][OH-]^3
Let x = moles/L of Cr(OH)3 that dissolve . This will give x moles /L Cr3+ and 3x moles/L OH-
Ksp = (x) (3x)^3 = 27 x^4

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