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Buffer pH Calculator
Calculate buffer solution pH using the Henderson-Hasselbalch Equation
Henderson-Hasselbalch Formula: $\text{pH} = pK_a + \log_{10} \left( \frac{[\text{A}^-]}{[\text{HA}]} \right)$
Where $[\text{A}^-]$ is the conjugate base (salt) concentration and $[\text{HA}]$ is the weak acid concentration.
Where $[\text{A}^-]$ is the conjugate base (salt) concentration and $[\text{HA}]$ is the weak acid concentration.
Solution Parameters
Calculation Results
⚠️ The Henderson-Hasselbalch equation provides an approximation and is most accurate for dilute solutions where activity coefficients can be approximated as 1. Extreme concentrations or extreme pH values (< 3 or > 11) may require corrections for autoionization of water.