Question: For a solution that is 0.100 M in [Fe(H 2 O) 6 ] 3+ , (a) Assuming that ionization of the aqua complex ion proceeds

For a solution that is 0.100 M in [Fe(H2O)6]3+, 

(a) Assuming that ionization of the aqua complex ion proceeds only through the first step, equation (24.10), calculate the pH of the solution.

(b) Calculate [[Fe(H2O)5(OH)]2+] if the solution is also 0.100 M HClO4. (ClO4– does not complex with Fe3+.)

(c) Can the pH of the solution be maintained so that [[Fe(H2O)5(OH)]2+] does not exceed 1 x 10–6 M? Explain.

Eq. 24.10

[Fe (HO)6]+ + HO = [FeOH(HO)5]+ + H3O+ K = 9 104 (24.10)

[Fe (HO)6]+ + HO = [FeOH (HO)5]+ + H3O+ K = 9 104 (24.10)

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