Arrange the following in increasing acidity: [Fe(OH2)6]2, [Fe(OH2)6]3, [Al(OH2)6]3
Understand the Problem
The question asks us to arrange the given metal aqua complexes in order of increasing acidity. This likely involves considering factors such as the charge and size of the metal ion, as well as the polarizing power, which affects the acidity of the coordinated water molecules.
Answer
[Fe(OH2)6]2+ < [Fe(OH2)6]3+ < [Al(OH2)6]3+
The order of increasing acidity is: [Fe(OH2)6]2+ < [Fe(OH2)6]3+ < [Al(OH2)6]3+
Answer for screen readers
The order of increasing acidity is: [Fe(OH2)6]2+ < [Fe(OH2)6]3+ < [Al(OH2)6]3+
More Information
Acidity increases with the charge on the metal ion. For ions with the same charge, acidity increases with the electronegativity of the metal ion.
Tips
A common mistake is to forget that a higher charge on the metal ion increases the acidity of the complex.
Sources
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