Which expression correctly relates the pH of a solution that contains a weak acid HA…

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

Problem

Which expression correctly relates the pH of a solution that contains a weak acid HA and its conjugate base A⁻ at equilibrium? (a)

pOH = pK_a + \log\dfrac{[A^-]}{[HA]}

(b)

pH = pK_a + \log\dfrac{[A^-]}{[HA]}

(c)

pH = pK_a - \log\dfrac{[A^-]}{[HA]}

(d)

pH = pK_a + \dfrac{[A^-]}{[HA]}