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Does "calculated with an equation" include evaluating the formula and trying to determine its [approximate] pH? For example, could evaluating the formula H2SO4 determine its approximate pH? Could comparing multiple formulas, such as HCl, HF and HBr, determine their relative pH to one another? Is there a general "philosophy" regarding their pH that can be understood from these formulas that could be applied to other R-Cl, R-F and R-Br formulas?
The first thing I would say is that there is no equation as such -- chemists do not think in terms of equations --
Here are the equations we "don't use"http://en.wikipedia.org/wiki/Hammett_equationThey are a subset of these ones http://en.wikipedia.org/wiki/Free-energy_relationship
With the aid of super computers it is possible to compute the mass of particles such as Protons from first principles so I would have thought it would be possible to compute the ph value of compounds although I cannot see any good reason for doing it.