Chemistry

Buffer pH Calculator (Henderson-Hasselbalch)

Find buffer pH from pKa and the acid/base ratio.

Calculated Output

pH 4.76

Formula: pH = pKa + log₁₀([A⁻] ÷ [HA])

Step-by-Step Breakdown

1. Values used:

2. pKa = 4.76

3. [Conjugate base] A⁻ = 0.1 M

4. [Acid] HA = 0.1 M

6. pKa x [Conjugate base] A⁻ = 4.76 x 0.1 = 0.476

7. pH = (pKa x [Conjugate base] A⁻) / [Acid] HA = 0.476 / 0.1 = 4.76

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The math behind it

pH = pKa + log₁₀([conjugate base] ÷ [acid]). When they're equal, pH = pKa.

pKa 4.76, equal concentrations → pH 4.76.

Best buffering?

Near the pKa, where the ratio is close to 1:1.