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A buffer solution is prepared by combining equal volumes of solutions of 0.2 M NaH2PO4 and 0.2 M K2HPO4. The pH of the buffer is measured as 6.87. A small amount of NaOH is added to the buffer. Which statement accurately describes what happens when the NaOH is added? а. The OH- reacts with some of the HPO4²- to make more H2PO4 and the pH decreases slightly The OH reacts with some of the HPO44- to make more H2PO4 and the pH increases slightly b. С. The strong base OH- causes the pH to increase significantly The OH reacts with some of the H2PO4¯ to make more HPO44- and the pH increases slightly d. The OH reacts with some of the H2PO4¯ to make more HPO42- and the pH decreases slightly е.

A buffer solution is prepared by combining equal volumes of solutions of 0.2 M NaH2PO4 and 0.2 M K2HPO4. The pH of the buffer is measured as 6.87. A small amount of NaOH is added to the buffer. Which statement accurately describes what happens when the NaOH is added? а. The OH- reacts with some of the HPO4²- to make more H2PO4 and the pH decreases slightly The OH reacts with some of the HPO44- to make more H2PO4 and the pH increases slightly b. С. The strong base OH- causes the pH to increase significantly The OH reacts with some of the H2PO4¯ to make more HPO44- and the pH increases slightly d. The OH reacts with some of the H2PO4¯ to make more HPO42- and the pH decreases slightly е.

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter14: Equilibria In Acid-base Solutions
Section: Chapter Questions
Problem 33QAP: A buffer is prepared in which the ratio [ H2PO4 ]/[ HPO42 ]is 3.0. (a) What is the pH of this...
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A buffer solution is prepared by combining equal volumes of solutions of 0.2 M NaH2PO4 and 0.2 M K2HP04. The pH of the buffer is measured as 6.87. A small amount of NaOH is added to the buffer. Which statement accurately describes what happens when the NaOH is added? а. The OH- reacts with some of the HPO4²- to make more H2PO4 and the pH decreases slightly The OH reacts with some of the HPO44- to make more H2PO4 and the pH increases slightly b. С. The strong base OH- causes the pH to increase significantly The OH- reacts with some of the H2PO4¯ to make more HPO44- and the pH increases slightly d. The OH- reacts with some of the H2PO4¯ to make more HPO42- and the pH decreases slightly е.
Transcribed Image Text:A buffer solution is prepared by combining equal volumes of solutions of 0.2 M NaH2PO4 and 0.2 M K2HP04. The pH of the buffer is measured as 6.87. A small amount of NaOH is added to the buffer. Which statement accurately describes what happens when the NaOH is added? а. The OH- reacts with some of the HPO4²- to make more H2PO4 and the pH decreases slightly The OH reacts with some of the HPO44- to make more H2PO4 and the pH increases slightly b. С. The strong base OH- causes the pH to increase significantly The OH- reacts with some of the H2PO4¯ to make more HPO44- and the pH increases slightly d. The OH- reacts with some of the H2PO4¯ to make more HPO42- and the pH decreases slightly е.
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