pKa to Ph conversion

pKa to pH conversion

If you have given the ionisation constant of a weak acid and its original concentration, the Ph of the the solution can be calculated.The approach used is the inverse of that followed in the tutorial Ph to pKa conversion, here Ka is known and Ph must be calculated.


First, lets see an example to understand this:


Nicotinic acid HC6H4O2N (Ka=1.4 x 10^-5), is another name for niacin , an important member of vitamin group.Determine  Ph of solution prepared by dissolving 0.10 mol of nicotinic acid,in water to form one liter of solution.

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