Dissociation Constant of Weak Acid given pKa Calculator

Dissociation Constant Formula:

\[ K_a = 10^{-pK_a} \]

Dissociation Constant of Weak Acid (Ka):

Definition: The Dissociation Constant (Ka) of a Weak Acid is a quantitative measure of the strength of a weak acid in solution.

Purpose: It helps chemists understand the extent to which a weak acid dissociates in aqueous solution.

The calculator uses the formula:

\[ K_a = 10^{-pK_a} \]

Where:

Explanation: The pKa value is converted back to the Ka value using the inverse logarithm relationship.

Details: Ka values help predict acid strength, buffer capacity, and reaction equilibrium in chemical systems.

Tips: Enter the pKa value (negative log of acid ionization constant). The calculator will return the Ka value.

Q1: What does a higher Ka value indicate?
A: A higher Ka value indicates a stronger acid that dissociates more completely in solution.

Q2: How are pKa and Ka related?
A: pKa is the negative logarithm (base 10) of Ka. They have an inverse relationship.

Q3: What's the range of typical Ka values?
A: For weak acids, Ka typically ranges from 10^-2 to 10^-12. Strong acids have much higher Ka values.

Q4: Why use pKa instead of Ka?
A: pKa provides a more convenient scale (typically 0-14) similar to pH, making comparisons easier.

Q5: How precise are these calculations?
A: The precision depends on the input pKa value. The calculator provides results to 6 decimal places.