Calculadora de Ka
Calcule a constante de dissociação ácida (Ka) para determinar a força de um ácido fraco.
M
M
M
Ka
0.000167
pKa3.78
Ka vs [H+] at Equilibrium
Formula
## How to Calculate Ka ### Formula **Ka = [H+][A-] / [HA]** For the equilibrium: HA <-> H+ + A-
Exemplo Resolvido
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
Perguntas Frequentes
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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