2023 AMC 10A Problems/Problem 25: Difference between revisions
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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. | |||
Revision as of 12:52, 5 November 2023
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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.
