A student performs a titration between 10.0 mL of a 0.25 M weak acid HA(aq) (Ka = 2.45 x 10 −5) and 0.25 M sodium hydroxide, NaOH(aq). Which of the following is true for the titration when 5.0 mL of sodium hydroxide has been added? HA(aq) + NaOH(aq) → NaA(aq) + H2O(l) The pH of the solution will be equal to −log(Ka). A buffer has formed between the sodium hydroxide and the conjugate acid of sodium hydroxide. Exactly half of the sodium hydroxide has reacted and Kb is equal to Ka. The titration is at equivalence.
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A student performs a titration between 10.0 mL of a 0.25 M weak acid HA(aq) (Ka = 2.45 x 10 −5) and 0.25 M sodium hydroxide, NaOH(aq). Which of the following is true for the titration when 5.0 mL of sodium hydroxide has been added?
HA(aq) + NaOH(aq) → NaA(aq) + H2O(l)
- The pH of the solution will be equal to −log(Ka).
- A buffer has formed between the sodium hydroxide and the conjugate acid of sodium hydroxide.
- Exactly half of the sodium hydroxide has reacted and Kb is equal to Ka.
- The titration is at equivalence.
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