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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(
)
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Select a base to autofill pKb (optional)
For a list of more acid and base dissociation constants, click here
| Compound Name ▲ ▼ | Formula ▲ ▼ | pKb ▲ ▼ |
| Ammonia | NH3 | 4.75 |
| Aniline | C6H5NH2 | 9.40 |
| Lithium Hydroxide | LiOH | -0.04 |
| Potassium Hydroxide | KOH | 10.91 |
| Sodium Hydroxide | NaOH | 0.2 |
| Methylamine | CH3NH2 | 3.36 |
| Dimethylamine | (CH3)2NH | 3.27 |
| Trimethylamine | (CH3)3N | 4.2 |
| Ethylamine | C2H5NH2 | 3.13 |
| Pyridine | C5H5N | 8.77 |
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This online tool may be cited as follows
MLA | "Quest Calculate™ Henderson-Hasselbalch Base Calculator." AAT Bioquest, Inc., 2 Sep. 2025, https://www.aatbio.com/tools/quick-calculator/henderson-hasselbalch-base-calculator. | |
APA | AAT Bioquest, Inc. (2025, September 2). Quest Calculate™ Henderson-Hasselbalch Base Calculator. AAT Bioquest. https://www.aatbio.com/tools/quick-calculator/henderson-hasselbalch-base-calculator. | |
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