How to use this calculator

Enter the value of pKa, the concentration of the acid, and the concentration of the conjugate base in their respective fields. Click on "Calculate pH" to compute the buffer solution's pH using the Henderson-Hasselbalch equation.

What is this calculator used for?

This Buffer pH Calculator is used to determine the pH of a buffer solution. It is especially useful in chemistry and biology to maintain pH stability in chemical reactions, laboratory solutions, or biological systems.

Formula

The formula used is the Henderson-Hasselbalch equation:

pH = pKa + log10([Base]/[Acid])

Example

Suppose you have a buffer with a pKa of 4.75, acid concentration of 0.1 M, and base concentration of 0.2 M. Then:

pH = 4.75 + log10(0.2 / 0.1) = 4.75 + log10(2) ≈ 4.75 + 0.301 = 5.05