[maverick1996]

Hey!

I was wondering is HClO4 stronger than H3PO4 because when ionised they both have 4 canonical forms (unless i have made a mistake)

But in the case of HClO4 the negative charge seems to be more delocalised and spread out thus making it a stronger acid.

Could somebody confirm this for me? Or correct it?

Thank you

[AWK]

Look at Pauling rules for oxoacid systematics.

[Borek]

Or better yet: compare Ka values. Hint: if you won't be able to find Ka value for perchloric acid it is is because it is so strong it is quite difficult to determine concentration of undissociated HClO₄ in the solution.

[maverick1996]

Thanks guys!