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Solubility product constant of Cr(OH)3 is L = 10 -31 mol4.dm-12. What is the equilibrium Cr3+ concentration in solution in contact with solid phase

Solubility product constant of Cr(OH)3 is L = 10 -31 mol4.dm-12. What is the equilibrium Cr3+ concentration in solution in contact with solid phase Cr(OH)3 at pH = 8 and at pH = 4?

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