pKa Calculator

Convert between Ka and pKa.

pKa 5.745

Formula: pKa = −log₁₀(Ka)

Step-by-step with your numbers:

1. Values used:

2. Acid dissociation constant (Ka) = 0

4. pKa = 5.745

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pKa measures acid strength — lower pKa means a stronger acid.

The math behind it

pKa = −log₁₀(Ka). To go back: Ka = 10^(−pKa).

Ka = 1.8 × 10⁻⁶ → pKa 5.74.

Buffer choice?

Buffers work best when the desired pH is near the acid's pKa.