HClO4 VS. H3PO4

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Ariel Fern 2B
Posts: 105
Joined: Fri Aug 30, 2019 12:17 am

HClO4 VS. H3PO4

Postby Ariel Fern 2B » Sat Dec 07, 2019 4:51 pm

How would you explain that HCLO4 is stronger than H3PO4? Do the extra hydrogens in H3PO4 play a role in this being the case, or should I just mention Cl's higher electronegativity leads to more electron withdrawal? Thanks!

John Arambulo 1I
Posts: 58
Joined: Sat Jul 20, 2019 12:15 am

Re: HClO4 VS. H3PO4

Postby John Arambulo 1I » Sat Dec 07, 2019 5:08 pm

Cl is definitely more electronegative than P which does account for why HClO4 is stronger, but you must look at the stability of the anion (conjugate base). ClO-4 has more resonance than H2PO4- (you can look up their structures on google), so it allows for more delocalization of the negative charge, meaning that it is more stable and thus is stronger.


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