Acid Dissociation Constant Calculator

Formula

To calculate the Acid Dissociation Constant:

\[ K_a = \frac{[A^-] \cdot [H^+]}{[HA]} \]

Where:

\( K_a \) is the Acid Dissociation Constant
\( [A^-] \) is the concentration of conjugate base of acid
\( [H^+] \) is the concentration of hydrogen ions
\( [HA] \) is the concentration of chemical species (HA)

What is Acid Dissociation Constant?

The Acid Dissociation Constant (Ka) is a measure of the strength of an acid in solution. It is the equilibrium constant for the dissociation of an acid into its conjugate base and a hydrogen ion. The larger the Ka value, the stronger the acid.

Example Calculation

Let's assume the following values:

Concentration of Conjugate Base \( [A^-] \) = 0.01 M
Concentration of Hydrogen Ions \( [H^+] \) = 0.02 M
Concentration of Chemical Species \( [HA] \) = 0.1 M

Step 1: Calculate the Acid Dissociation Constant:

\[ K_a = \frac{0.01 \cdot 0.02}{0.1} = \frac{0.0002}{0.1} = 0.002 \]

So, the Acid Dissociation Constant (Ka) is 0.002.