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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 $1 \times 10^{-5}$ .