Part A What is the pH of a buffer prepared by adding 0.708 mol of the weak acid HA to 0.507 mol of NaA in 2.00 L of solution? The dissociation constant K, of HA is 5.66 x 10 7. Express the pH numerically to three decimal places. > View Available Hint(o) pH = Submit Part B What is the pHafter 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid. Express the pH numerically to three decimal places. • View Available Hintțo) ? Pav DA pH = Submit
Part A What is the pH of a buffer prepared by adding 0.708 mol of the weak acid HA to 0.507 mol of NaA in 2.00 L of solution? The dissociation constant K, of HA is 5.66 x 10 7. Express the pH numerically to three decimal places. > View Available Hint(o) pH = Submit Part B What is the pHafter 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid. Express the pH numerically to three decimal places. • View Available Hintțo) ? Pav DA pH = Submit
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Part C
What is the pH after 0.195 mol of NaOH is added to the buffer from Part A? Assume no volume change on the addition of the base.
Express the pH numerically to three decimal places.
• View Available Hint(s)
pH =
Submit
![Part A
When a solution contains a weak acid and its conjugate base or a weak
base and its conjugate acid, it will be a buffer solution. Buffers resist change
in pH following the addition of acid or base. A buffer solution prepared from a
weak acid (HA) and its conjugate base (A) is represented as
What is the pH of a buffer prepared by adding 0.708 mol of the weak acid HA to 0.507 mol of NaA in 2.00 L of solution? The dissociation constant K of HA is 5.66 x 10-7.
Express the pH numerically to three decimal places.
HA(aq) = H+ (aq) + A-(aq)
• View Available Hint(s)
The buffer will follow Le Châtelier's principle. If acid is added, the reaction
shifts to consume the added H+, forming more HA. When base
the base will react with Ht, reducing its concentration. The reaction then
shifts to replace H+ through the dissociation of HA into H+ and A. In
both instances, H+] tends to remain constant.
added,
V AZO
The pH of a buffer is calculated by using the Henderson-Hasselbalch
pH =
equation:
pH = pK, + log-
[A]
HA]
Submit
Part B
What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid.
Express the pH numerically to three decimal places.
• View Available Hint(s)
?
pH =
Submit](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F983f8bb4-8f07-4098-8306-e588c6bd6c5d%2Fe80a8143-d0fe-41f9-ac4b-2a136f94aa28%2F9kbomo_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Part A
When a solution contains a weak acid and its conjugate base or a weak
base and its conjugate acid, it will be a buffer solution. Buffers resist change
in pH following the addition of acid or base. A buffer solution prepared from a
weak acid (HA) and its conjugate base (A) is represented as
What is the pH of a buffer prepared by adding 0.708 mol of the weak acid HA to 0.507 mol of NaA in 2.00 L of solution? The dissociation constant K of HA is 5.66 x 10-7.
Express the pH numerically to three decimal places.
HA(aq) = H+ (aq) + A-(aq)
• View Available Hint(s)
The buffer will follow Le Châtelier's principle. If acid is added, the reaction
shifts to consume the added H+, forming more HA. When base
the base will react with Ht, reducing its concentration. The reaction then
shifts to replace H+ through the dissociation of HA into H+ and A. In
both instances, H+] tends to remain constant.
added,
V AZO
The pH of a buffer is calculated by using the Henderson-Hasselbalch
pH =
equation:
pH = pK, + log-
[A]
HA]
Submit
Part B
What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid.
Express the pH numerically to three decimal places.
• View Available Hint(s)
?
pH =
Submit
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