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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(

)
Select an acid to autofill pKa (optional)
Compound NameFormulapKa
Acetic AcidC2H4O24.76
Boric AcidH3BO39.24
Carbonic AcidH2CO36.37
Hydrochloric AcidHCl-5.9
Citric AcidC6H8O72.79
Hydrofluoric AcidHF3.19
Nitric AcidHNO3-1.38
Oxalic AcidC2H2O41.46
Phosphoric AcidH3PO42.15
Sulfuric AcidH2SO4-3
For a list of more acid and base dissociation constants, click here

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References
This online resource may be cited as follows
MLA
"Quest CalculateHenderson-Hasselbalch Acid Calculator." AAT Bioquest, Inc.23 Sep2025https://www.aatbio.com/tools/quick-calculator/henderson-hasselbalch-acid-calculator.
APA
AAT Bioquest, Inc. (2025September 23). Quest CalculateHenderson-Hasselbalch Acid Calculator. AAT Bioquest. https://www.aatbio.com/tools/quick-calculator/henderson-hasselbalch-acid-calculator.
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