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pH of a Buffer Solution

pH of a buffer solution is calculated by applying Henderson-Hasselbalch equation. In order to derive this equation let us consider an acidic buffer consisting of weak acid HA and its salt NaA

Ka = [H3O+ ] [ Salt] / [Acid] [H3O+] = Ks [Acid] / Salt]

-log [H3O+] = – log Ka – log [Acid] / Salt]