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Consider the substitution reaction: [M(H2O)6]+n + H218O -> [M(H2O)5(H218O)]+n + H2O The rate of H2O exchange...

Consider the substitution reaction: [M(H2O)6]+n + H218O -> [M(H2O)5(H218O)]+n + H2O

The rate of H2O exchange varies over many magnitudes depending on the metal ion. Place the following metal complexes in order of increasing rate of H2O substitution (slowest to fastest) and give your reasoning.

a) Na+(aq), Al3+(aq), Mg2+(aq)

b) [Fe(H2O)6]2+ , [Cu(H2O)6]2+ , [V(H2O)6]2+

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