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What is the molar solubility of iron(III) hydroxide (Ksp = 2.5 x 10-39) in water at...

What is the molar solubility of iron(III) hydroxide (Ksp = 2.5 x 10-39) in water at 25

Solutions

Expert Solution

Fe(OH)3 Fe3+ + 3OH -

Let s be the molar solubility of Fe(OH)3 in mol/L

1 mole of Fe(OH)3 produces 1 mole of Fe3+ and 3 moles of OH -

Then [ Fe3+ ] = s

       [OH - ] = 3s

Solubility product constant , KSP = [ Fe3+ ] [OH - ] 3

                                                = s x (3s)3

                                                = 27 s 4

                                           

                                          

                                            s = 9.8x10 -11 mol/L

Therefore option (a) is correct


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