Difference between revisions of "2023 AMC 10A Problems/Problem 25"
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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 13:52, 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.
