A student titrates an unknown weak acid, HA, to a pale pink phenolphthalein endpoint with 25.0 mL of 0.100 M NaOH. The student then titrates in 13.0 mL of 0.100 M HCI to the solution containing the neutralized unknown acid (HCl was delivered from a second buret). The pH of the resulting solution is pH = 4.7 (the %3D solution after the HCI has been added). Which of the following statements is true? The pka of the acid is 4.7. At pH = 4.7, half of the conjugate base, A¯, has been converted to HA. The pk, of the acid is less than 4.7. More than one of these statements is correct. The pka of the acid is greater than 4.7.
A student titrates an unknown weak acid, HA, to a pale pink phenolphthalein endpoint with 25.0 mL of 0.100 M NaOH. The student then titrates in 13.0 mL of 0.100 M HCI to the solution containing the neutralized unknown acid (HCl was delivered from a second buret). The pH of the resulting solution is pH = 4.7 (the %3D solution after the HCI has been added). Which of the following statements is true? The pka of the acid is 4.7. At pH = 4.7, half of the conjugate base, A¯, has been converted to HA. The pk, of the acid is less than 4.7. More than one of these statements is correct. The pka of the acid is greater than 4.7.
Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter14: Acid- Base Equilibria
Section: Chapter Questions
Problem 97AE: A student intends to titrate a solution of a weak monoprotic acid with a sodium hydroxide solution...
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Transcribed Image Text:A student titrates an unknown weak acid, HA, to a pale pink phenolphthalein
endpoint with 25.0 mL of 0.100 M NAOH. The student then titrates in 13.0 mL of
0.100 M HCI to the solution containing the neutralized unknown acid (HCI was
delivered from a second buret). The pH of the resulting solution is pH = 4.7 (the
solution after the HCI has been added).
Which of the following statements is true?
The pka of the acid is 4.7.
At pH = 4.7, half of the conjugate base, A¯, has been converted to HA.
The pka of the acid is less than 4.7.
More than one of these statements is correct.
The pka of the acid is greater than 4.7.
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