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They are different. The pH is that of the solution whereas the pKa is the negative log of the acid equilibrium constant for a particular acid (-log(Ka)). This is used as a measure of acid strength for that acid.
pH is the hydronium ion concentration of the solution. The pH is the negative logarithm of the hydronium ion activity. pKa is the negative base -10 logarithm of the acid dissociation constant of a solution. The lower the pKa value, the stronger the acid.
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