Acid Dissociation Calculator
Calculate acid dissociation constant (Ka), pKa, and percent dissociation for weak acids.
Dissociation Parameters
Calculate:
4.74
014
0.1 M
0.001 M1 M
M
Ka Value
1.8197e-5
Ka
1.8197e-5
pKa
4.7400
pH
2.8700
[H+]
1.3490e-3 M
Percent Dissociation:
1.3490%
Formulas:
Ka = [H+][A-] / [HA]
pKa = -log(Ka)
[H+] = sqrt(Ka * C)
% Dissociation = ([H+] / C) * 100
Understanding Acid Dissociation
The acid dissociation constant (Ka) is a quantitative measure of the strength of an acid in solution. It represents the equilibrium constant for the dissociation of a weak acid into its conjugate base and hydrogen ion. A larger Ka value indicates a stronger acid that dissociates more completely. The pKa is simply the negative logarithm of Ka, making it easier to compare acid strengths.
Common Weak Acids
| Acid | Formula | Ka | pKa |
|---|---|---|---|
| Acetic Acid | CH3COOH | 1.8 x 10^-5 | 4.74 |
| Formic Acid | HCOOH | 4.5 x 10^-4 | 3.35 |
| Hydrofluoric Acid | HF | 7.5 x 10^-3 | 2.12 |
| Carbonic Acid | H2CO3 | 4.3 x 10^-7 | 6.37 |