A 0.186 M solution of the salt NaA has a pH of 8.40. Calculate the Ka value of the acid HA. A) 3.4*10–11 B) 7.4 *10–10 C) 2.9 *10–4 D) 1.2 *102 E) none of these

ANS: C PTS: 1 DIF: Moderate REF: 14.8 KEY: Chemistry | general chemistry | acids and bases | solutions of a weak acid or base | acid-base properties of salt solutions MSC: Quantitative