The solubility product constant (Ksp) for the dissolution of Cu(OH)2 as represented by the chemical equation is 2.6 x 10-19.

Question

Cu(OH)2 (s) Cu2+ (aq) + 2 OH- (aq)

Calculate the moles of Cu(OH)2 that dissolves in 1900 mL of water.

i know how to do it when its one to one but for these i always get confused on the (1/2) and x^2 and what you do with it.

Answer 1

Cu(OH)2 ==> Cu^2+ + 2OH^-
....x........x.......2x
Ksp = (Cu^2+)(OH^-)²
Ksp = (x)(2x)²
Ksp = 4x³
x = ?

Answer 2

4.0 x 10^-7