pH Calculator

Estimate the pH of a strong or weak acid/base solution from its concentration.

Solution type

Concentration (M, mol/L)

pKa (weak acid) or pKb (weak base)

The weak acid/base calculations use the standard small-x (Ka « C) approximation of the Henderson-Hasselbalch/equilibrium expression. This approximation breaks down at very low concentrations or when Ka/Kb is not small relative to C — treat results as estimates.

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