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Comparing acidity of 2 complexes

(1/1)

Winga:
[Fe(H2O)6]3+ vs [Fe(H2O)5(OH)]2+

Which is more acidic? The 1st one.

I am confused with using which approach to explain it.

Mitch:
I thiught the hexaaqua comples had a pKa similar to regular water?

Winga:
I found it from a book, it depends on the charge density of metal ion.

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