Ka → pKa
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
pKa
About this calculator
The Ka to pKa calculator is a useful tool for chemists and chemistry students. It helps calculate the acid dissociation constant (Ka) from the acid dissociation constant inverse (pKa) and vice versa, using the formula pKa = −log(Ka).
The acid dissociation constant (Ka) is a measure of the strength of an acid in water, while the acid dissociation constant inverse (pKa) is a measure of the basicity of the conjugate acid of an acid. The relationship between Ka and pKa is crucial to understand acid-base reactions under different conditions.
This calculator is especially useful for calculating the acid dissociation and basicity constants of organic and inorganic compounds, which are fundamental in many chemical reactions. Additionally, it is essential to be careful when calculating the acid dissociation and basicity constants, as small variations can significantly affect the reaction.
Frequently asked questions
What is the acid dissociation constant (Ka)?
The acid dissociation constant (Ka) is a measure of the strength of an acid in water. It is calculated as the ratio of the concentration of hydrogen ions (H+) to the concentration of acid in solution.
When should I use this calculator?
This calculator should be used when you need to calculate the acid dissociation and basicity constants of organic and inorganic compounds to better understand acid-base reactions.
How can I avoid errors when calculating the acid dissociation and basicity constants?
It is essential to be careful when calculating the acid dissociation and basicity constants, as small variations can significantly affect the reaction. Make sure to have the correct concentrations and calculate the constants with precision.
Can I calculate the acid dissociation constant (Ka) from the acid dissociation constant inverse (pKa)?
Yes, you can calculate the acid dissociation constant (Ka) from the acid dissociation constant inverse (pKa) using the formula pKa = −log(Ka).