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Cr(OH)2 ⇔ Cr2+ + 2OH-
s s 2s
Ksp Cr(OH)2 = [s] [2s]²
1,08 x 10^-19 = 4s³
s³ = 0,027 x 10^-18
s = 0,3 x 10^-6
s = 3 x 10^-7 mol/L
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