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Henderson-Hasselbalch Base Calculator
The Henderson-Hasselbalch equation is used to determine the pOH of a base solution when given the concentration of the base, its conjugate acid, and the dissociation constant. The equation is written as:
pOH = pKb + log (
[BH+][B]
)
...where pKb is the dissociation constant, [B] is the concentration of the base, and [BH+] is the concentration of the conjugate acid. This calculator will determine a fourth unknown value in the equation when provided with any three other values.
=
+log10(

)
Select a base to autofill pKb (optional)
Compound NameFormulapKb
AmmoniaNH34.75
AnilineC6H5NH29.40
Lithium HydroxideLiOH-0.04
Potassium HydroxideKOH10.91
Sodium HydroxideNaOH0.2
MethylamineCH3NH23.36
Dimethylamine(CH3)2NH3.27
Trimethylamine(CH3)3N4.2
EthylamineC2H5NH23.13
PyridineC5H5N8.77
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 Base Calculator." AAT Bioquest, Inc.23 Sep2025https://www.aatbio.com/tools/quick-calculator/henderson-hasselbalch-base-calculator.
APA
AAT Bioquest, Inc. (2025September 23). Quest CalculateHenderson-Hasselbalch Base Calculator. AAT Bioquest. https://www.aatbio.com/tools/quick-calculator/henderson-hasselbalch-base-calculator.
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