I need a full answers for self-test 4.6. please help me with the correct answer

Question

I need a full answers for self-test 4.6. please help me with the correct answer

EXAMPLE 4.6 Accounting for trends in aqua acid strength Account for the trend in acidity [Fe(OH,J,] [Fe(OH2), [AIOH) [Hg(OH,)P Answer We need to consider the charge density on the metal centre and its effect on the ease with which the H,0 ligands can be deprotonated. The weakest acid is the Fe complex on account of its relatively large ionic radius and low charge. The increase of charge to +3 increases the acid strength. The greater acidity of Al3+ can be explained by its smaller radi This complex reflects the failure of an ionic model because in the complex there is a large transfer of positive charge to oxygen as a result of covalent bonding. us. The anomalous ion in the series is the Hg complex. Selftest 4.6 Arange [Na(0H,) acidity ISc(OH) (Mn(OH),]p, and (Ni(OH),JP* in order of increasing

Explanation / Answer

[Ni(OH2)6]^2+ > [Sc(OH2)6]^2+ > [Mn(OH2)6]^2+ > [Na(OH2)6]^+

As charge on cation increases, the size of cation decreases and hence the acidic nature of complexes also increases

Ths size of given metal ions are in the order of Na+ >Sc^2+ > Mn^2+ > Ni^2+

the order of acidity of these ions are in the order of Na+ < Sc^2+ < Mn^2+ < Ni^2+

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