basic

pH of a Salt of a Weak Acid by Hydrolysis Calculator

pH = ½ · (pKw + pKa + log₁₀ C) for an A⁻ salt.

Compute the pH of an aqueous solution of the conjugate base of a weak acid (A⁻ from a strong-base / weak-acid salt). The dilute-solution closed form is pH = ½ · (pK_w + pK_a + log₁₀ C). Defaults match a sodium acetate solution.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

mol/L

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

pH = ½ · (pK_w + pK_a + log₁₀ C)

In depth

Compute the pH of an aqueous solution of the conjugate base of a weak acid (A⁻ from a strong-base / weak-acid salt). The dilute-solution closed form is pH = ½ · (pK_w + pK_a + log₁₀ C). Defaults match a sodium acetate solution.