Enter the acid concentration and the pH value into the calculator to determine the acid ionization constant (Ka). This calculator helps in understanding the strength of an acid in a solution.
Acid Ionization Constant Formula
The following formula is used to calculate the acid ionization constant (Ka):
Ka = [H<sup>+</sup>] * [A<sup>-</sup>]
Variables:
- Ka is the acid ionization constant
- [H+] is the concentration of hydrogen ions in the solution, which can be calculated from the pH value as [H+] = 10-pH
- [A–] is the concentration of the acid in the solution (mol/L)
To calculate the acid ionization constant, multiply the concentration of hydrogen ions by the concentration of the acid in the solution.
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.
How to Calculate Acid Ionization Constant?
The following steps outline how to calculate the Acid Ionization Constant (Ka).
- First, determine the concentration of the acid in the solution ([A–]) in moles per liter (mol/L).
- Next, determine the pH value of the solution.
- Calculate the concentration of hydrogen ions ([H+]) using the pH value: [H+] = 10-pH.
- Finally, calculate the Acid Ionization Constant (Ka) using the formula: Ka = [H+] * [A–].
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Acid concentration ([A–]) = 0.1 mol/L
pH value = 3.5
