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 HA (aq) H¹ (aq) + A (aq) The buffer will follow Le Châtelier's principle. If acid is added, the reaction shifts to consume the added H¹, forming more HA. When base is added, the base will react with H. reducing its concentration. The reaction then shifts to replace H+ through the dissociation of HA into Hand A. In both instances. [H] tends to remain constant. The pH of a buffer is calculated by using the Henderson-Hasselbalch equation: [A] pH=pK₂ +log HA ▾ ▼ Part A What is the pH of a buffer prepared by adding 0.607 mol of the weak acid HA to 0.507 mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA is 5.66 x 10 7 Express the pH numerically to three decimal places. ▸ View Available Hint(s) pH- Submit Part B pH= Submit ΠΙΑΣΦΑ Part C What is the pH after 0.150 mol of HCI 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) 1 196] ΑΣΦ C 3 ? C ? Review | Constants | Periodic Table 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)
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 HA (aq) H¹ (aq) + A (aq) The buffer will follow Le Châtelier's principle. If acid is added, the reaction shifts to consume the added H¹, forming more HA. When base is added, the base will react with H. reducing its concentration. The reaction then shifts to replace H+ through the dissociation of HA into Hand A. In both instances. [H] tends to remain constant. The pH of a buffer is calculated by using the Henderson-Hasselbalch equation: [A] pH=pK₂ +log HA ▾ ▼ Part A What is the pH of a buffer prepared by adding 0.607 mol of the weak acid HA to 0.507 mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA is 5.66 x 10 7 Express the pH numerically to three decimal places. ▸ View Available Hint(s) pH- Submit Part B pH= Submit ΠΙΑΣΦΑ Part C What is the pH after 0.150 mol of HCI 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) 1 196] ΑΣΦ C 3 ? C ? Review | Constants | Periodic Table 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)
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 65QAP: Follow the directions of Question 64. Consider two beakers: Beaker A has a weak acid(K a=1105)....
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Question
![+ pH Changes in Buffers
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
HA (aq) → H¹ (aq) + A (aq)
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 is
added, the base will react with H+, 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.
The pH of a buffer is calculated by using the Henderson-Hasselbalch
equation:
A]
pH =pK₂ +log HA
▼
Part A
pH =
What is the pH of a buffer prepared by adding 0.607 mol of the weak acid HA to 0.507 mol of NaA in 2.00 L of solution? The dissociation constant K₁ of HA is
5.66 x 10-7
Express the pH numerically to three decimal places.
▸ View Available Hint(s)
Submit
Part B
pH =
Submit
IV. ΑΣΦ
Part C
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)
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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)
9 of 39
Review | Constants | Periodic Table](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2eb625aa-5214-4c13-acfb-22e1dc70de69%2Fd0df912f-2fdd-42e6-83f7-84980a5e7b6d%2F6qck2u4_processed.jpeg&w=3840&q=75)
Transcribed Image Text:+ pH Changes in Buffers
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
HA (aq) → H¹ (aq) + A (aq)
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 is
added, the base will react with H+, 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.
The pH of a buffer is calculated by using the Henderson-Hasselbalch
equation:
A]
pH =pK₂ +log HA
▼
Part A
pH =
What is the pH of a buffer prepared by adding 0.607 mol of the weak acid HA to 0.507 mol of NaA in 2.00 L of solution? The dissociation constant K₁ of HA is
5.66 x 10-7
Express the pH numerically to three decimal places.
▸ View Available Hint(s)
Submit
Part B
pH =
Submit
IV. ΑΣΦ
Part C
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)
n
IVD ΑΣΦ
[w]]
n
?
[www] ?
<
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)
9 of 39
Review | Constants | Periodic Table
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