Which of the following mathematical expressions correctly relates the pH of a buffer…

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Which of the following mathematical expressions correctly relates the pH of a buffer solution to the acid dissociation constant (KaK_a) of the weak acid and the ratio of the concentrations of its conjugate base (A−A^-) to the acid (HAHA)? (a) pH=pKa+[A−][HA]\text{pH} = \text{p}K_a + \dfrac{[A^-]}{[HA]} (b) pH=Ka+log⁡([A−][HA])\text{pH} = K_a + \log\left(\dfrac{[A^-]}{[HA]}\right) (c) pH=pKa+log⁡([A−][HA])\text{pH} = pK_a + \log\left(\dfrac{[A^-]}{[HA]}\right) (d) pH=pKa+log⁡([HA][A−])\text{pH} = pK_a + \log\left(\dfrac{[HA]}{[A^-]}\right)

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