pH Buffer Calculator

Calculate buffer solution compositions using the Henderson-Hasselbalch equation

Buffer Parameters

Buffer System

Target pH

Total Buffer Concentration (M)

Final Volume (mL)

Henderson-Hasselbalch Equation

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

Buffer Recipe

[Base]/[Acid] = 0.631

Required Chemicals

KH2PO4 (Acid)

8.344 g

61.31 mmol

K2HPO4 (Base)

6.738 g

38.69 mmol

Buffer Properties

pKa7.20

Effective RangepH 6.2 - 8.2

Buffer Capacity0.0546 M