Buffer Preparation Calculator

Determine the exact mass of reagents needed using the Henderson-Hasselbalch equation.

Target pH

Buffer pKa

Target Concentration (M)

Final Volume (L)

MW Acid Form (g/mol)

MW Base Form (g/mol)

Mass of Acid [HA]

0.00 g

Mass of Conjugate Base [A⁻]

0.00 g

Henderson-Hasselbalch Application

For a buffer to be effective, its $pKa$ should be within $\pm 1$ pH unit of your target pH. This calculator determines the molar ratio of the conjugate base to the weak acid, applies your desired total concentration, and converts the molarities to absolute mass based on your target volume.

Formulas used:
Ratio (R) = 10^(pH - pKa)
[HA] = Total_Concentration / (1 + R)
[A⁻] = Total_Concentration * R / (1 + R)
Mass = Molarity * Volume * Molecular_Weight