Question

What are the equilibrium reactions for Cr(OH)3(s) when it comes into contact with rain water?

What are the equilibrium reactions for Cr(OH)3(s) when it comes into contact with rain water?

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Answer #1

As we know that Cr(OH)3(s) is soluble in water.

therefore

when Cr(OH)3(s) comes into contact of rain water , then Cr(OH)3(s) dissolves in rain water

and after that Cr(OH)3 dissociates into its constituents ions Cr3+ and OH- ions

thus

the  the equilibrium reactions for Cr(OH)3 (s) solubility in rain water is given as:

Cr(OH)3(s) <-----> Cr(OH)3 (aq) <------------> Cr^3+ (aq) + 3 OH- (aq)

and

the equilibrium constant for this reaction is given as :

Ksp = [Cr3+]*[OH-]^3

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