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A 50.0-mL sample of a 0.100 Af solution of a week acid HA has an equilibrium pH of 4.00. After to = 10-3mol of a substance X rs added to the solution. rt is observed that the pH of the solution Increases What might be true about substance X7 X might be a strong base that partially neutralized some weak acid. II. X might be a strong acid that made the solution more addle. III. X might be a soluble ionic compound containing the anion A-