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# What Is the Difference Between PKa and PH?

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In chemistry, the main difference between pH and pKa is that pH tells the level of hydrogen ions in a certain medium while pKa value indicates the degree at which an acid dissociates or the side at which equilibrium is favored, according to Tutor Vista.

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Additionally, pKa is usually the logarithm of Ka value while pH is the inverse of H+ concentration logarithm. While there is a difference between pKa and pH, the two items are related. According to Tutor Vista, determine the pH and pKa relationship by using the Henderson-Hasselbach equation shown below:

pH = pKa + log $\frac{[A^-]}{[HA]}$

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