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Henderson-Hasselbalch Equation

pH = pKa + log([A-]/[HA]), relating pH to the dissociation constants of weak acids, relevant in enzyme mechanisms.
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The statement of the theorem

For a weak acid HA\text{HA} and its conjugate base A−\text{A}^-, the relationship between the pH\text{pH} and the acid dissociation constant (KaK_a) is given by:\npH=pKa+log⁡([A−][HA])\text{pH} = pK_a + \log\left(\frac{[A^-]}{[HA]}\right)\nwhere pKa=−log⁡(Ka)pK_a = -\log(K_a).
Source: Wikipedia