A weak monoprotic acid HA is titrated with a strong base

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

Problem

A weak monoprotic acid HA is titrated with a strong base. At the half-equivalence point, which relationship between the measured pH of the solution and the acid’s dissociation constant is correct? (a) pH=14−pKa\text{pH} = 14 - pK_a (b) pH=pKa2\text{pH} = \dfrac{pK_a}{2} (c) pH=pKa\text{pH} = pK_a (d) pH=7+pKa2\text{pH} = 7 + \dfrac{pK_a}{2}

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