2023 AMC 10A Problems/Problem 25
Revision as of 15:46, 5 November 2023 by Kaisssssgao (talk | contribs)
25. Let HA represent a weak monoprotic acid with
Ka = 1.0×10−5. In an experiment, a 50.0 mL
sample of 0.10 mol L−1 HA(aq) is titrated with
0.10 mol L−1 NaOH(aq). At which point during the
titration are the equilibrium concentrations of H+
and OH− equal?
A after the addition of exactly 25.0 mL of NaOH(aq)
B after the addition of slightly less than 50.0 mL of NaOH(aq)
C after the addition of exactly 50.0 mL of NaOH(aq)
D after the addition of more than 50.0 mL of NaOH(aq)
E The equilibrium concentrations of H+ and OH− are never equal. -Kaisssssgao
