Ka to Kb
Type a value in Ka to get it in Kb instantly.
2.101×10⁻¹⁵Kb
That's 12× as weak as the hydronium ion, while formic acid is 26,767× weaker. That is a strong acid: essentially fully dissociated in water.
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 Ka to Kb
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 Ka = 2.101×10⁻¹⁵ Kb.
Every unit
Your acid strength in every unit
Tables
Ka to Kb conversion table
| Ka | Kb |
|---|---|
| 1×10⁻¹⁶ Ka | 100 Kb |
| 1×10⁻¹⁴ Ka | 1 Kb |
| 5.01×10⁻¹¹ Ka | 0.000199601 Kb |
| 5.62×10⁻¹⁰ Ka | 1.779×10⁻⁵ Kb |
| 6.31×10⁻⁸ Ka | 1.585×10⁻⁷ Kb |
| 4.47×10⁻⁷ Ka | 2.237×10⁻⁸ Kb |
| 1.74×10⁻⁵ Ka | 5.747×10⁻¹⁰ Kb |
| 0.000178 Ka | 5.618×10⁻¹¹ Kb |
| 0.01 Ka | 1×10⁻¹² Kb |
| 1 Ka | 1×10⁻¹⁴ Kb |
| 1,000 Ka | 1×10⁻¹⁷ Kb |
| 10,000,000 Ka | 1×10⁻²¹ Kb |
| 1×10¹⁰ Ka | 1×10⁻²⁴ Kb |
Kb to Ka conversion table
| Kb | Ka |
|---|---|
| 1×10⁻²⁴ Kb | 1×10¹⁰ Ka |
| 1×10⁻²¹ Kb | 10,000,000 Ka |
| 1×10⁻¹⁷ Kb | 1,000 Ka |
| 1×10⁻¹⁴ Kb | 1 Ka |
| 1×10⁻¹² Kb | 0.01 Ka |
| 5.62×10⁻¹¹ Kb | 0.000177936 Ka |
| 5.75×10⁻¹⁰ Kb | 1.739×10⁻⁵ Ka |
| 2.24×10⁻⁸ Kb | 4.464×10⁻⁷ Ka |
| 1.58×10⁻⁷ Kb | 6.329×10⁻⁸ Ka |
| 1.78×10⁻⁵ Kb | 5.618×10⁻¹⁰ Ka |
| 0.0002 Kb | 5×10⁻¹¹ Ka |
| 1 Kb | 1×10⁻¹⁴ Ka |
| 100 Kb | 1×10⁻¹⁶ Ka |
Quick answers
Quick answers
- How many Kb is 1 Ka?
- 1 Ka is 1×10⁻¹⁴ Kb.
- How many Kb is 10 Ka?
- 10 Ka is 1×10⁻¹⁵ Kb.
- How many Kb is 4.76 Ka?
- 4.76 Ka is 2.101×10⁻¹⁵ Kb.
The units
About these units
Ka (Ka)
The dissociation constant itself, in moles per liter.
Kb (Kb)
The base dissociation constant of the conjugate base.
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