a. Calculate the pH of a 0.2 M acetate buffer (a solution containing 0.1 mol L-l acetic acid and 0.1 mol L- sodium acetate), given that the pKa of acetic acid is 4.7. b. What would be the pH value after adding 0.05 mol of NaOH to 1 L of 0.2 mol L' acetate buffer? c. Compare the pH value in (b) with that obtained after adding 0.05 mol NaOH to 1 L of water (a simple solution of 0.05 mol L·1 NaOH).
a. Calculate the pH of a 0.2 M acetate buffer (a solution containing 0.1 mol L-l acetic acid and 0.1 mol L- sodium acetate), given that the pKa of acetic acid is 4.7. b. What would be the pH value after adding 0.05 mol of NaOH to 1 L of 0.2 mol L' acetate buffer? c. Compare the pH value in (b) with that obtained after adding 0.05 mol NaOH to 1 L of water (a simple solution of 0.05 mol L·1 NaOH).
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 32QAP: Enough water is added to the buffer in Question 30 to make the total volume 5.00 L. (a) Calculate...
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![7. Refer to the following table:
Table 2-2. Change in pH of 0.2 M Acetate Buffer after addition of Acid or Base
[Base]:[Acid]
0.005:0.195
Addition
pH
HC1 0.095 mol
3.1
HC1 0.075
0.025:0.175
3.9
HС1 0.05
НС1 0.025
0.05:0.15
4.2
0.075:0.125
4.5
0.1:0.1
0.125:0.075
4.7
NaOH 0.025 mol
4.9
NaOH 0.05 mol
0.15:0.05
5.2
NaOH 0.75 mol
0.175:0.025
5.5
NaOH 0.095 mol
0.195:0.005
6.3
a. Calculate the pH of a 0.2 M acetate buffer (a solution containing 0.1 mol L-' acetic acid and 0.1 mol L-1
sodium acetate), given that the pKa of acetic acid is 4.7.
b. What would be the pH value after adding 0.05 mol of NaOH to 1 L of 0.2 mol L1 acetate buffer?
c. Compare the pH value in (b) with that obtained after adding 0.05 mol NAOH to 1 L of water (a simple
solution of 0.05 mol L-' NaOH).
d. How much acid or base can be added to 1 L of the 0.2 M acetate buffer so that the pH does not change
appreciably (i.e., what is its buffer range)?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3b82cc96-60c1-4003-bcea-55371104e8e5%2Fcb8248a1-5a92-421a-9651-680d4361d207%2Fzpapo3af_processed.png&w=3840&q=75)
Transcribed Image Text:7. Refer to the following table:
Table 2-2. Change in pH of 0.2 M Acetate Buffer after addition of Acid or Base
[Base]:[Acid]
0.005:0.195
Addition
pH
HC1 0.095 mol
3.1
HC1 0.075
0.025:0.175
3.9
HС1 0.05
НС1 0.025
0.05:0.15
4.2
0.075:0.125
4.5
0.1:0.1
0.125:0.075
4.7
NaOH 0.025 mol
4.9
NaOH 0.05 mol
0.15:0.05
5.2
NaOH 0.75 mol
0.175:0.025
5.5
NaOH 0.095 mol
0.195:0.005
6.3
a. Calculate the pH of a 0.2 M acetate buffer (a solution containing 0.1 mol L-' acetic acid and 0.1 mol L-1
sodium acetate), given that the pKa of acetic acid is 4.7.
b. What would be the pH value after adding 0.05 mol of NaOH to 1 L of 0.2 mol L1 acetate buffer?
c. Compare the pH value in (b) with that obtained after adding 0.05 mol NAOH to 1 L of water (a simple
solution of 0.05 mol L-' NaOH).
d. How much acid or base can be added to 1 L of the 0.2 M acetate buffer so that the pH does not change
appreciably (i.e., what is its buffer range)?
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