Difference between revisions of "2023 AMC 10A Problems/Problem 25"
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and OH− equal? | and OH− equal? | ||
A after the addition of exactly 25.0 mL of NaOH(aq) | A after the addition of exactly 25.0 mL of NaOH(aq) | ||
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B after the addition of slightly less than 50.0 mL of | B after the addition of slightly less than 50.0 mL of | ||
NaOH(aq) | NaOH(aq) | ||
| + | |||
C after the addition of exactly 50.0 mL of NaOH(aq) | C after the addition of exactly 50.0 mL of NaOH(aq) | ||
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D after the addition of more than 50.0 mL of | D after the addition of more than 50.0 mL of | ||
NaOH(aq) | NaOH(aq) | ||
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E The equilibrium concentrations of H+ and OH− are | E The equilibrium concentrations of H+ and OH− are | ||
never equal. | never equal. | ||
-Kaisssssgao | -Kaisssssgao | ||
Revision as of 12:54, 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. -Kaisssssgao
