pKa to pKb
Type a value in pKa to get it in pKb instantly.
9.24pKb
That's about the same as acetic acid. That is a moderately strong acid, the range of the carboxylic acids.
Convert the other way: pKb to pKa
What it means
How strong is that acid?
Values are for water at 25 °C. pKa shifts with solvent and temperature, and in a protein an ordinary side chain can move several units.
The math
How to convert pKa to pKb
pKa is a logarithm: pKa = −log₁₀(Ka), and back again Ka = 10^(−pKa). In water at 25 °C, pKa + pKb = 14, and the free energy is ΔG° = 5.708 × pKa kJ/mol.
Example: 4.76 pKa = 9.24 pKb.
Every unit
Your acid strength in every unit
Tables
pKa to pKb conversion table
| pKa | pKb |
|---|---|
| -10 pKa | 24 pKb |
| -7 pKa | 21 pKb |
| -3 pKa | 17 pKb |
| 0 pKa | 14 pKb |
| 2 pKa | 12 pKb |
| 3.75 pKa | 10.25 pKb |
| 4.76 pKa | 9.24 pKb |
| 6.35 pKa | 7.65 pKb |
| 7.2 pKa | 6.8 pKb |
| 9.25 pKa | 4.75 pKb |
| 10.3 pKa | 3.7 pKb |
| 14 pKa | 0 pKb |
| 16 pKa | -2 pKb |
pKb to pKa conversion table
| pKb | pKa |
|---|---|
| -10 pKb | 24 pKa |
| -7 pKb | 21 pKa |
| -3 pKb | 17 pKa |
| 0 pKb | 14 pKa |
| 2 pKb | 12 pKa |
| 3.75 pKb | 10.25 pKa |
| 4.76 pKb | 9.24 pKa |
| 6.35 pKb | 7.65 pKa |
| 7.2 pKb | 6.8 pKa |
| 9.25 pKb | 4.75 pKa |
| 10.3 pKb | 3.7 pKa |
| 14 pKb | 0 pKa |
| 16 pKb | -2 pKa |
Quick answers
Quick answers
- How many pKb is 1 pKa?
- 1 pKa is 13 pKb.
- How many pKb is 10 pKa?
- 10 pKa is 4 pKb.
- How many pKb is 4.76 pKa?
- 4.76 pKa is 9.24 pKb.
The units
About these units
pKa (pKa)
The negative logarithm of the dissociation constant. Lower means stronger.
pKb (pKb)
The same for the conjugate base. pKa and pKb always add to 14 in water.
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