pH Buffer Calculator
Calculate buffer solution compositions using the Henderson-Hasselbalch equation
Buffer Parameters
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
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.