Answer Questions #27 through #31 about the titration curves below (labeled a and b) for two different bases. The titrant acid used in both cases was 0.100 M HCI and the volume of the base solutions in both cases was 75.0 mL mL. 14 14 12- 12 - 10- 10 8- 8. 6. 6. 4- 4- 2- 0. 0 20 40 60 80 100 20 40 60 80 100 (a) Volume of acid added (mL) Volume of acid added (mL) (b) 2014 Peaon Education nc Hd Hd

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Chapter1: Chemical Foundations
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Answer Questions #27 through #31 about the titration curves below (labeled a and b) for two different
bases. The titrant acid used in both cases was 0.100 M HCl and the volume of the base solutions in both
cases was 75.0 mL mL.
14
14
12
12 -
10-
10
8-
6.
4.
2-
2-
20
40
60
80
100
20
40
60
80
100
Volume of acid added (mL)
(a)
(b)
Volume of acid added (mL)
2014 Pearson Education Inc
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Transcribed Image Text:Answer Questions #27 through #31 about the titration curves below (labeled a and b) for two different bases. The titrant acid used in both cases was 0.100 M HCl and the volume of the base solutions in both cases was 75.0 mL mL. 14 14 12 12 - 10- 10 8- 6. 4. 2- 2- 20 40 60 80 100 20 40 60 80 100 Volume of acid added (mL) (a) (b) Volume of acid added (mL) 2014 Pearson Education Inc P Type here to search 11:17 AM (? 3/18/2021 -> ort sc 80 6. ece num ER/TY || на 0 04 2C Hd
28. Which of the two titrations has a base solution that is more concentrated?
A) (a)
B) (b)
C) Both (a) and (b) are the same concentration
D) It is impossible to say without knowing the exact Kp values of the two bases.
E) Titrating with HCl won't work. You need to use another acid in the titration.
29. Which titration has the stronger base (larger Kb value)? Be careful: Make sure you compare the Kp values of
the bases, not the Ka values of the conjugate acids. Also, don't forget the relationship between Kband pKb.
A) (a)
B) (b)
C) Both (a) and (b) are the same pKp.
D) It is impossible to say without knowing the exact Kb values of the two bases.
E) Titrating with HCl won't work. You need to use another acid in the titration.
30. Could the base titrated in (b) be used as part of a buffer? If so, what pH could be maintained by this buffer?
A) Yes, pH = 10
Yes, pH = 8
C) Yes, pH = 5
D) No
E) It is impossible to say because the titration curve is for a strong base.
31. Choose an indicator from the table on p. 817 of your textbook that would be suitable to signal the
equivalence point of titration (b).
A) crystal violet
B) bromphenol blue
C) phenol red
D) phenolphthalein
E) alizarin yellow R
Transcribed Image Text:28. Which of the two titrations has a base solution that is more concentrated? A) (a) B) (b) C) Both (a) and (b) are the same concentration D) It is impossible to say without knowing the exact Kp values of the two bases. E) Titrating with HCl won't work. You need to use another acid in the titration. 29. Which titration has the stronger base (larger Kb value)? Be careful: Make sure you compare the Kp values of the bases, not the Ka values of the conjugate acids. Also, don't forget the relationship between Kband pKb. A) (a) B) (b) C) Both (a) and (b) are the same pKp. D) It is impossible to say without knowing the exact Kb values of the two bases. E) Titrating with HCl won't work. You need to use another acid in the titration. 30. Could the base titrated in (b) be used as part of a buffer? If so, what pH could be maintained by this buffer? A) Yes, pH = 10 Yes, pH = 8 C) Yes, pH = 5 D) No E) It is impossible to say because the titration curve is for a strong base. 31. Choose an indicator from the table on p. 817 of your textbook that would be suitable to signal the equivalence point of titration (b). A) crystal violet B) bromphenol blue C) phenol red D) phenolphthalein E) alizarin yellow R
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