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Constante de acidez - Wikipedia, la enciclopedia libre

Constante de acidez

De Wikipedia, la enciclopedia libre

En química, dado un ácido débil, AH, su disolución en agua está sujeta al equilibrio :

AH + H2O ↔ A- + H3O+

A menudo escrito:

AH ↔ A- + H+

La constante de acidez o constante de disociación ácida, Ka, de AH/A- viene definida por:

K_a = \frac{[A^- ] \cdot \left[\mbox{H}_3\mbox{O}^+\right]} {[AH]}

el pKa es:

pKa = − logKa

([AH] indica la concentración molar de AH en una solución).

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