To find pH of a weak acid (monoprotic) solution, insert concentration (M)

Weak acid solution

Weak acids

Ka

Ka

(expression for this calculator)

Acetic acid

1.75 x 10-5

1.75Ε-5

Formic acid

1.77 x 10-4

1.77Ε-4

Benzoic acid

6.30 x 10-5

6.30Ε-5

Lactic acid

1.39 x 10-4

1.39Ε-4

Salicylic acid

1.06 x 10-3

1.06Ε-3

The following table lists examples on acid dissociation (ionization) constants, Ka, for some weak acids at 25 °C.
Online pH Calculator
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