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

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Metal-Aqua Ions
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What are metal-aqua ions?

Metal ions coordinated with six water molecules

Water molecules in metal-aqua complexes

Six

Metals forming [M(H2O)6]2+[M(H_2O)_6]^{2+}

FeFe and CuCu (in +2 state)

Metals forming [M(H2O)6]3+[M(H_2O)_6]^{3+}

AlAl and FeFe (in +3 state)

More acidic: [M(H2O)6]2+[M(H_2O)_6]^{2+} or [M(H2O)6]3+[M(H_2O)_6]^{3+}?

[M(H2O)6]3+[M(H_2O)_6]^{3+}

Reason for higher acidity of 3+ ions

Higher charge density

Effect of high charge density on O−HO-H bonds

Weakens O−HO-H bonds

What does [M(H2O)6]3+[M(H_2O)_6]^{3+} release to increase acidity?

H+H^+ ions

Formula: 2+ metal-aqua ion

[M(H2O)6]2+[M(H_2O)_6]^{2+}

Formula: 3+ metal-aqua ion

[M(H2O)6]3+[M(H_2O)_6]^{3+}

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