oxoacid strength - conceptual

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Ashley R 1A
Posts: 41
Joined: Sat Aug 24, 2019 12:16 am

oxoacid strength - conceptual

Postby Ashley R 1A » Thu Dec 05, 2019 2:56 am

what's the conceptual reasoning behind why oxoacids are stronger when they have more oxygen atoms? i'm lost about the relationship between the oxidation number of the central atom and the amount of oxygen atoms within a compound.

Sean Cheah 1E
Posts: 105
Joined: Wed Sep 18, 2019 12:20 am

Re: oxoacid strength - conceptual

Postby Sean Cheah 1E » Thu Dec 05, 2019 9:25 am

One of the factors that affect the strength of an acid is the net electron-withdrawing force acting on the H+ that the acid can donate. In the case of oxoacids, increasing the number of oxygens increases this electron-withdrawing force and further polarizes the compound by shifting the electron density away from the H+. Additionally, increasing the number of oxygens is able to better stabilize the conjugate base by more evenly distributing the resulting negative charge among the remaining atoms (as can be seen by drawing out the resonance structures).


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