Quiz 6 Practice, Chemistry 111, Lycoming College, Mar. 16, 2005, Dr. Mahler

 

Fair Game for Friday’s Quiz: All previous material (Ch. 11, 12, 13, 14, 15). New Material – Chapter 15 Sections 5, 6, 7, 8, 9. Relevant Homework: Ch. 15 new problems –

53, 56, 59, 64, 67, 70, 73, 77, 80, 83, 86, 87.  First four were fair game for exam two but not asked. (all keys on web: http://www.lycoming.edu/chem/spring2005/111/keys.htm)

 

Practice problems:

 

1) Possible essay / short answer type questions: Chapter 15 Review Questions 14, 15 (page 690)

 

2) Calculate the pH of the following solutions: a) 0.20 M NaCH3COO; b) 0.10 M NH4Cl

 

3) Calculate the pH of the following solutions: a) a solution that is 0.20 M in HBrO and 0.10 M in KBrO; b) a solution that is 0.030 M in HCN and 0.050 M in NaCN.

 

4) Which of the following solutions can function as a buffer solution and calculate the pH of the ones that are buffers: a) equal volumes of 0.10 M HCl and 0.10 M NaCl; b) a solution that is 0.10 M C5H5N and 0.10 M C5H5NHCl; c) a solution that is made from equal volumes of 0.20 M CH3COOH and 0.10 M NaOH.

 

5) For each pH calculated above, pick the indicator(s) whose color changing point is closest to the pH found.