Reactions of Ions in Aqueous Solution (A Level only) (AQA A-Level Chemistry): Quizzes

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Metal-Aqua Ions
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How many water molecules coordinate to a metal ion in a metal-aqua complex?

Six

Which oxidation state forms [M(H2O)6]3+[\text{M}(\text{H}_2\text{O})_6]^{3+} ions?

+3 oxidation state

Which metals form [M(H2O)6]2+[\text{M}(\text{H}_2\text{O})_6]^{2+} ions?

Fe and Cu

Which metal forms [M(H2O)6]3+[\text{M}(\text{H}_2\text{O})_6]^{3+} ions?

Aluminium

Which metal-aqua ion is more acidic?

[M(H2O)6]3+[\text{M}(\text{H}_2\text{O})_6]^{3+}

Why are [M(H2O)6]3+[\text{M}(\text{H}_2\text{O})_6]^{3+} ions more acidic?

Higher charge density

What effect does higher charge density have on coordinated water molecules?

Weakens O−HO-H bonds

What is formed when [M(H2O)6]3+[\text{M}(\text{H}_2\text{O})_6]^{3+} releases H+\text{H}^+?

[M(H2O)5(OH)]2+[\text{M}(\text{H}_2\text{O})_5(\text{OH})]^{2+}

Why does a 3+ ion have higher charge density than a 2+ ion?

Greater positive charge vs size

Which metal-aqua ion has lower charge density?

[Cu(H2O)6]2+[\text{Cu}(\text{H}_2\text{O})_6]^{2+}

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