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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: kui on March 02, 2009, 08:58:43 AM

Title: Acidity of oxo acid of Phosphorus
Post by: kui on March 02, 2009, 08:58:43 AM

Order of acidity:H3PO2 > H3PO3 > H3PO4

Why the order goes like this?
according to what i know is that acid strength will increase with the no. of oxo group

e.g HClO4 > HClO3 > HClO2 > HClO..

Pls help !!!

Title: Re: Acidity of oxo acid of Phosphorus
Post by: Borek on March 02, 2009, 02:17:31 PM

Check structures of each acid. Are they all triprotic?

Title: Re: Acidity of oxo acid of Phosphorus
Post by: kui on March 02, 2009, 11:46:42 PM

no , they aren't , but how is it related to the acidity?

Title: Re: Acidity of oxo acid of Phosphorus
Post by: Borek on March 03, 2009, 03:17:09 AM

Rule you refer to has no application here, regardles of formulas these acids don't have more and more oxygens connected to the central atom (compare with structure of chloric acids that you have listed).