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s s 2s
Ksp Cr(OH)2 = [Cr²⁺][OH⁻]²
Ksp Cr(OH)2 = [s] [2s]²
1,08 x10⁻¹⁹ = 4s³
s³ = 27 x10⁻²¹
s= 3 x10⁻⁷ mol/liter