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Henderson-Hasselbalch Acid Calculator
The Henderson-Hasselbalch equation is used to determine the pH of an acid solution when given the concentration of the acid, its conjugate base, and the dissociation constant. The equation is written as:
pH = pKa + log ([A-][HA]
)
...where pKa is the dissociation constant, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the acid. This calculator will determine a fourth unknown value in the equation when provided with any three other values.
=+log10(
)
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Select an acid to autofill pKa (optional)
For a list of more acid and base dissociation constants, click here
| Compound Name ▲ ▼ | Formula ▲ ▼ | pKa ▲ ▼ |
| Acetic Acid | C2H4O2 | 4.76 |
| Boric Acid | H3BO3 | 9.24 |
| Carbonic Acid | H2CO3 | 6.37 |
| Hydrochloric Acid | HCl | -5.9 |
| Citric Acid | C6H8O7 | 2.79 |
| Hydrofluoric Acid | HF | 3.19 |
| Nitric Acid | HNO3 | -1.38 |
| Oxalic Acid | C2H2O4 | 1.46 |
| Phosphoric Acid | H3PO4 | 2.15 |
| Sulfuric Acid | H2SO4 | -3 |
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This online tool may be cited as follows
MLA | "Quest Calculate™ Henderson-Hasselbalch Acid Calculator." AAT Bioquest, Inc., 2 Sep. 2025, https://www.aatbio.com/tools/quick-calculator/henderson-hasselbalch-acid-calculator. | |
APA | AAT Bioquest, Inc. (2025, September 2). Quest Calculate™ Henderson-Hasselbalch Acid Calculator. AAT Bioquest. https://www.aatbio.com/tools/quick-calculator/henderson-hasselbalch-acid-calculator. | |
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