The Henderson-Hasselbalch equation is:
p H = p K a + l o g [ A − ] [ A H ] {\displaystyle pH=pKa+log{\frac {[A^{-}]}{[AH]}}}
![{\displaystyle pH=pKa+log{\frac {[A^{-}]}{[AH]}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/fc427a2806dc050b0b08e9ba9f9aba72efa28c7e)