Thu February 07, 2013 By: Monali Balani

What factors determine the acidity of an oxide and why are oxides in higher oxidation state more acidic ?

Expert Reply
Thu February 07, 2013
The polarity, size of the bonded atom, and charge, the electronegativity difference.
As the oxidation state of the central atom in an oxide increases, the strength of the acid increases significantly.  As the oxidation state of an atom increases, its tendency to draw electrons in a bond toward itself increases. In anoxide, the central atom pulls electrons away from the oxygen, consequently making the oxygen more electronegative. Therefore, bond becomes more polar, making it easier to form ions and thus increasing the strength of the acid.
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