The significant difference between the ionization constant values of [ F e ( H 2 O ) 6 ] 3 + and [ F e ( H 2 O ) 6 ] 2 + has to be explained. Concept introduction: Hydrated transition metal ions are weak acids. There are M − O − H bonds in the hydrated metal ions. Transition metal ions have large charges and small sizes to attract the shared pair of the M − O bonds to the metal ion itself. This attraction weakens the O − H bond making the hydrogen of the M − O − H bond more acidic than it would be in the O − H bond of a water molecule that is not bonded to a metal ion. Thus, hydrated transition metal ions can donate proton and the solution becomes acidic.

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Chapter 14, Problem 75QRT

Interpretation Introduction

Interpretation:

The significant difference between the ionization constant values of [Fe(H2O)6]3+ and [Fe(H2O)6]2+ has to be explained.

Concept introduction:

Hydrated transition metal ions are weak acids. There are M−O−H bonds in the hydrated metal ions. Transition metal ions have large charges and small sizes to attract the shared pair of the M−O bonds to the metal ion itself.

This attraction weakens the O−H bond making the hydrogen of the M−O−H bond more acidic than it would be in the O−H bond of a water molecule that is not bonded to a metal ion. Thus, hydrated transition metal ions can donate proton and the solution becomes acidic.

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