Cierto compuesto orgánico que se usa como indicador en...

Cierto compuesto orgánico que se usa como indicador en reacciones ácido-base existe en disolución acuosa en concentraciones iguales de la forma ácida, HB, y la forma básica, $\mathrm{B}^{-}$, a un $\mathrm{pH}$ de 7.80. ¿Cuál es el $\mathrm{p} K_a$ de la forma ácida de este indicador, $\mathrm{HB}$ ?

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Key Concepts

Henderson-Hasselbalch Equation

This equation provides a relationship between the pH of a solution, the acid dissociation constant (pKa), and the ratio of the concentrations of the conjugate base to the acid. It is a fundamental tool in acid-base chemistry used to describe how the equilibrium between an acid and its conjugate base determines the pH of a solution.

Acid Dissociation Constant (pKa)

The pKa is a measure of the strength of an acid, indicating the pH at which the acid is half dissociated into its conjugate base. It is crucial in understanding acid-base equilibria as it defines the tendency of an acid to donate a proton, with equal concentrations of acid and conjugate base occurring when pH equals pKa.

Acid-Base Indicators

Acid-base indicators are compounds that exhibit different colors in their protonated and deprotonated forms, allowing them to signal changes in the pH of a solution. Their color change at particular pH values is directly related to the equilibrium between the two forms, making them useful for detecting endpoints in titrations and other analytical applications.

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