12 3 pts at volumes below the volume determined in

  • University of Texas
  • CH 204
  • Lab Report
  • jjmarre
  • 10
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12. (3 pts) At volumes below the volume determined in Step 14 of the Data Analysis, discuss the relative changes in pH following subsequent HCl additions. What happened to the 8
Worksheet & Grading Rubric – Weak Acids and Buffers pH following subsequent additions of HCl after the Step 14 volume was reached? Why? Include the titration curve and second derivative curve from the Part C Data Analysis.
13. (4 pts) Compare the two buffering capacities obtained from Discussion Questions 9 and 12. Theoretically, these two values should be identical. Why? Use as much detail as possible in this explanation.
9 A. M. Bohnsack Spring 2019 (revised Z. Baranová)
Worksheet & Grading Rubric – Weak Acids and Buffers resistance to the buffer solution. However, the buffering capacity from the NaOH titration was 0.479 M and the HCl titration was 0.133 M. The HCl buffering capacity is clearly much less than the NaOH. This may be due to differing ratios of proton acceptor and proton donors. 14. (3 pts) If the concentrations of both acetic acid and acetate were doubled when preparing the buffer, would you expect the buffering capacity to increase, decrease, or stay the same? Why?
15. (2 pts) Describe two observed/possible sources of error in this experiment and discuss how to prevent them.
10 A. M. Bohnsack Spring 2019 (revised Z. Baranová)

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