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Reactions of Ions in Aqueous Solution

A2

Transition Metals

Inorganic

AQA Content

Explain, in terms of the charge/size ratio of the metal ion, why the acidity of [M(H2O)6]3+ is greater than that of [M(H2O)6]2+
Describe and explain the simple test-tube reactions of: M2+(aq) ions, limited to M = Fe and Cu, and of M3+(aq) ions, limited to M = Al and Fe, with the bases OH–, NH3 and CO32–

Specification Notes

In an aqueous solution, the following metal-aqua ions are formed:
[M(H2O)6]2+, limited to M = Fe and Cu
[M(H2O)6]3+, limited to M = Al and Fe
The acidity of [M(H2O)6]3+ is greater than that of [M(H2O)6]2+
Some metal hydroxides show amphoteric character by dissolving in both acids and bases (eg hydroxides of Al3+).

Notes

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