I have in my notes from 9 years ago, this handy equation for prediction of pKa's for oxyacids. I was using Huheey at the time, and the equation isn't there. In fact, I can't find it ANYWHERE. I am certain that I did not develop this equation.... Does anyone recognize it? Where is it from? And which electronegativity values does it use?
pKa ~ 10.5 -5n - (chi)X
(HO)mX(O)n; chi is the electronegativity of the central atom X, n is the number of oxos.
I have found several other equations, but none of them take into account the central element...
its driving me crazy!