Calculateur de Ka
Calculez la constante d'acidité Ka d'un acide faible.
M
M
M
Ka
0.000167
pKa3.78
Ka vs [H+] at Equilibrium
Formule
## How to Calculate Ka ### Formula **Ka = [H+][A-] / [HA]** For the equilibrium: HA <-> H+ + A-
Exemple Résolu
At equilibrium: [H+]=0.004, [A-]=0.004, [HA]=0.096 M.
- 01Ka = (0.004 × 0.004) / 0.096
- 02Ka = 0.000016 / 0.096
- 03Ka = 1.67 × 10^-4
- 04pKa = -log10(1.67 × 10^-4) = 3.78
Questions Fréquentes
What is Ka?
The acid dissociation constant measures the strength of a weak acid. Larger Ka means stronger acid (more dissociation).
What is pKa?
pKa = -log10(Ka). Lower pKa means stronger acid. It is more convenient for comparing acids.
Do strong acids have Ka values?
Strong acids fully dissociate, so their Ka is very large (effectively infinite). Ka is mainly used for weak acids.
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