**Henderson–Hasselbalch equation - Wikipedia**
https://en.wikipedia.org/wiki/Henderson%E2%80%93Hasselbalch_equation

In chemistry and biochemistry, the Henderson–Hasselbalch equation = + ([] []) can be used to estimate the pH of a buffer solution.The numerical value of the acid dissociation constant, K a, of the acid is known or assumed.The pH is calculated for given values of the concentrations of the acid, HA and of a salt, MA, of its conjugate base, A-; for example, the solution may contain acetic ...

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