Acid Ionization Constant Calculator

Formula

The formula to calculate the Acid Ionization Constant (Ka) is:

\[ K_a = [H^+] \times [A^-] \]

Where:

\(K_a\) is the Acid Ionization Constant
\([H^+]\) is the concentration of hydrogen ions
\([A^-]\) is the concentration of the acid in the solution (mol/L)

What is an Acid Ionization Constant?

The acid ionization constant (Ka) is a quantitative measure of the strength of an acid in solution. It is the equilibrium constant for the ionization reaction of the acid in water and is a reflection of the acid’s ability to donate hydrogen ions (H+). A larger Ka value indicates a stronger acid that ionizes more completely in water.

Example Calculation

Let's assume the following values:

pH Value = 3.0
Concentration of Acid ([A^-]) = 0.01 mol/L

Using the formula:

\[ [H^+] = 10^{-3} = 0.001 \text{ mol/L} \]

\[ K_a = [H^+] \times [A^-] = 0.001 \times 0.01 = 0.00001 \]

The Acid Ionization Constant (Ka) is \(1 \times 10^{-5}\).