pKa to kilojoules per mole
Type a value in pKa to get it in kJ/mol instantly.
27.17kJ/mol
That's about the same as acetic acid. That is a moderately strong acid, the range of the carboxylic acids.
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 kJ/mol
To convert pKa to kilojoules per mole, multiply by 5.70795.
Example: 4.76 pKa × 5.70795 = 27.1698 kJ/mol.
In the other direction, 1 kJ/mol = 0.175194 pKa.
Every unit
Your acid strength in every unit
Tables
pKa to kJ/mol conversion table
| pKa | kJ/mol |
|---|---|
| -10 pKa | -57.0795 kJ/mol |
| -7 pKa | -39.9557 kJ/mol |
| -3 pKa | -17.1239 kJ/mol |
| 0 pKa | 0 kJ/mol |
| 2 pKa | 11.4159 kJ/mol |
| 3.75 pKa | 21.4048 kJ/mol |
| 4.76 pKa | 27.1698 kJ/mol |
| 6.35 pKa | 36.2455 kJ/mol |
| 7.2 pKa | 41.0972 kJ/mol |
| 9.25 pKa | 52.7985 kJ/mol |
| 10.3 pKa | 58.7919 kJ/mol |
| 14 pKa | 79.9113 kJ/mol |
| 16 pKa | 91.3272 kJ/mol |
kJ/mol to pKa conversion table
| kJ/mol | pKa |
|---|---|
| -10 kJ/mol | -1.75194 pKa |
| -7 kJ/mol | -1.22636 pKa |
| -3 kJ/mol | -0.525583 pKa |
| 0 kJ/mol | 0 pKa |
| 2 kJ/mol | 0.350388 pKa |
| 3.75 kJ/mol | 0.656978 pKa |
| 4.76 kJ/mol | 0.833925 pKa |
| 6.35 kJ/mol | 1.11248 pKa |
| 7.2 kJ/mol | 1.2614 pKa |
| 9.25 kJ/mol | 1.62055 pKa |
| 10.3 kJ/mol | 1.8045 pKa |
| 14 kJ/mol | 2.45272 pKa |
| 16 kJ/mol | 2.80311 pKa |
Quick answers
Quick answers
- How many kJ/mol is 1 pKa?
- 1 pKa is 5.70795 kJ/mol.
- How many kJ/mol is 10 pKa?
- 10 pKa is 57.0795 kJ/mol.
- How many kJ/mol is 4.76 pKa?
- 4.76 pKa is 27.1698 kJ/mol.
The units
About these units
pKa (pKa)
The negative logarithm of the dissociation constant. Lower means stronger.
Kilojoules per mole (kJ/mol)
The free energy of dissociation at 25 °C: ΔG° = 5.71 × pKa.
Keep going