Acidity Constant (Ka) Calculator

Calculate Acidity Constant (Ka)





Formula

The formula to calculate the Acidity Constant (Ka) is:

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

Where:

Definitions

Example

Let's say the concentration of hydrogen ions ([H+]) is 0.01 M, the concentration of the conjugate base ([A–]) is 0.02 M, and the concentration of the weak acid ([HA]) is 0.1 M. Using the formula:

\[ K_a = \frac{0.01 \times 0.02}{0.1} \]

We get:

\[ K_a = 0.002 \]

So, the acidity constant (Ka) is 0.002.

Extended information about "Acidity-Constant-Ka-Calculator"

Calculate Ka of Weak Acid from pH

Definition: The acid dissociation constant (Ka) measures the strength of a weak acid in solution.

Formula: \( K_a = \frac{[H^+][A^-]}{[HA]} \)

Example: \( K_a = \frac{10^{-3} \times 10^{-3}}{0.1} \)

How to Calculate Ka of Acetic Acid

Definition: Acetic acid is a weak acid, and its dissociation in water can be described by its Ka value.

Formula: \( K_a = \frac{[H^+][CH_3COO^-]}{[CH_3COOH]} \)

Example: \( K_a = \frac{10^{-4} \times 10^{-4}}{0.05} \)

Ka Acid Dissociation Constant

Definition: The acid dissociation constant (Ka) quantifies the strength of an acid in solution.

Formula: \( K_a = \frac{[H^+][A^-]}{[HA]} \)

Example: \( K_a = \frac{10^{-5} \times 10^{-5}}{0.2} \)

pH from Ka Calculation

Definition: The pH of a solution can be calculated using the Ka value of the acid and the concentrations of the species involved.

Formula: \( \text{pH} = -\log[H^+] \)

Example: \( \text{pH} = -\log(10^{-3}) \)