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s?
Cr(OH)2 -> + 2
ksp = 4
s =
Ksp = [Cr2+] [OH-]^2
1,08 × 10^-19 = s × (2s)^2
1,08 × 10^-19 = 4s^3
s = ∛1,08 × 10^-19 / 4
s = ∛36 × 10^-21
s = 3,3 × 10^-7 M