4. A 100-ml buffer solution with pH of 4.80 is prepared as a stock solution. Using this stock buffer solution, three buffers are prepared by diluting a given volume of the stock buffer (as shown below) to 100 mL with water. Butter 1 2 3 Volume used from original solution, ml. 50 10 20 [Buffer 3] > [Buffer 2]> [Buffer 1] [Buffer 3] = [Buffer 2] = [Buffer 1] [Buffer 3] = [Buffer 2]> [Buffer 1] [Buffer 3] > [Buffer 2] = [Buffer 1] Final volume, ml. 100 100 100 a. Do they have the same pH? Check the box corresponding your answer. Yes No b. Which is true about their absolute concentrations? Check the box corresponding your answer. [Buffer 1]> [Buffer 2]> [Buffer 3) c. Which is true about their concentration ratios? Check the box corresponding your answer. [Buffer 1]> [Buffer 2]> [Buffer 3) [Buffer 3] > [Buffer 2]> [Buffer 1] [Buffer 3] = [Buffer 2] = [Buffer 1] [Buffer 3] = [Buffer 2]> [Buffer 1] [Buffer 3] > [Buffer 2] - [Buffer 1)

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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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4.
A 100 mL buffer solution with pH of 4.80 is prepared as a stock solution. Using this stock buffer
solution, three buffers are prepared by diluting a given volume of the stock buffer (as shown below)
to 100 mL with water.
Buffer
1
a.
b.
e
a.
E
Do they have the same pH? Check the box corresponding your answer.
Yes
No
Which is true about their absolute concentrations? Check the box corresponding your answer.
[Buffer 1]> [Buffer 2] > [Buffer 3)
[Buffer 3] > [Buffer 2]> [Buffer 1]
[Buffer 3] = [Buffer 2] = [Buffer 1)
[Buffer 3] = [Buffer 2] > [Buffer 1)
[Buffer 3] > [Buffer 2] = [Buffer 1)
d. Which of the following is true about the ability of the three buffers to resist pH change when 1 mL
of HCI is added to each buffer? Check the box corresponding your answer.
Which is true about their concentration ratios? Check the box corresponding your answer.
[Buffer 1]> [Buffer 2] > [Buffer 3)
[Buffer 3] > [Buffer 2]> [Buffer 1)
[Buffer 3] = [Buffer 2] = [Buffer 1)
Solution
A
B
C
D
[Buffer 3] = [Buffer 2] > [Buffer 1)
[Buffer 3] > [Buffer 2] = [Buffer 1]
Ability to resist pH change: Buffer 1 < Buffer 2 < Buffer 3
Ability to resist pH change: Buffer 1 > Buffer 2 > Buffer 3
Ability to resist pH change: Buffer 1 = Buffer 2 = Buffer 3
Ability to resist pH change: Buffer 1 < Buffer 2 = Buffer 3
Ability to resist pH change: Buffer 1 = Buffer 2 < Buffer 3
Which solution has the highest buffer capacity? Check the box corresponding your answer.
Buffer 1
Buffer 2
5. From the stock solutions of 1.00-mol Lacetic acid and 1.00-mol L of sodium acetate, six solutions
were prepared with the acetic acid and acetate concentrations shown in the table below. The pk of
acetic acid is 4.756.
с
D
Buffer 3
Their buffer capacities are equal
Volume used from
original solution, ml
5
10
20
Solution
A
B
Solution
A*
B
C
D
Acetic ac
mol L
0.0000351
0.10
0.010
0.10
0.15
* Use quadratic formula:
[Acetic acid, mol L
0.0000351
0.10
0.010
0.10
0.15
Determine the volume of the stock solutions of 1.00-mol Lacetic acid and 1.00-mol L of
sodium acetate needed to prepare the solutions. Write your answer in the table below.
ax²+bx+c = 0
Final volume, ml
0.010
0.10
100
100
100
0
0.10
Acetate, mol L Final volume, ml.
100
100
0.010
0.15
0.10
b. Calculate for the initial pH of the solutions and write the pH in the table below.
[Acetic acid, mol L
[Acetate), mol L
0.0000351
0.10
0
0.10
C Which solution(s) have the same pH?
Vol. acetic acid, Acetate, mol Vol. of ecstate,
mL
mL
d. Which solution is closest to the pK,?
L¹
0
0.10
0.010
0.15
0.10
-bv-400
20
100
100
100
0.010
0.15
https://www.calculatorsoup.com/calculators/algebra/quadratic-formula calculator.pho
Finel volume,
mL
100
100
100
100
100
Initial pH
Transcribed Image Text:4. A 100 mL buffer solution with pH of 4.80 is prepared as a stock solution. Using this stock buffer solution, three buffers are prepared by diluting a given volume of the stock buffer (as shown below) to 100 mL with water. Buffer 1 a. b. e a. E Do they have the same pH? Check the box corresponding your answer. Yes No Which is true about their absolute concentrations? Check the box corresponding your answer. [Buffer 1]> [Buffer 2] > [Buffer 3) [Buffer 3] > [Buffer 2]> [Buffer 1] [Buffer 3] = [Buffer 2] = [Buffer 1) [Buffer 3] = [Buffer 2] > [Buffer 1) [Buffer 3] > [Buffer 2] = [Buffer 1) d. Which of the following is true about the ability of the three buffers to resist pH change when 1 mL of HCI is added to each buffer? Check the box corresponding your answer. Which is true about their concentration ratios? Check the box corresponding your answer. [Buffer 1]> [Buffer 2] > [Buffer 3) [Buffer 3] > [Buffer 2]> [Buffer 1) [Buffer 3] = [Buffer 2] = [Buffer 1) Solution A B C D [Buffer 3] = [Buffer 2] > [Buffer 1) [Buffer 3] > [Buffer 2] = [Buffer 1] Ability to resist pH change: Buffer 1 < Buffer 2 < Buffer 3 Ability to resist pH change: Buffer 1 > Buffer 2 > Buffer 3 Ability to resist pH change: Buffer 1 = Buffer 2 = Buffer 3 Ability to resist pH change: Buffer 1 < Buffer 2 = Buffer 3 Ability to resist pH change: Buffer 1 = Buffer 2 < Buffer 3 Which solution has the highest buffer capacity? Check the box corresponding your answer. Buffer 1 Buffer 2 5. From the stock solutions of 1.00-mol Lacetic acid and 1.00-mol L of sodium acetate, six solutions were prepared with the acetic acid and acetate concentrations shown in the table below. The pk of acetic acid is 4.756. с D Buffer 3 Their buffer capacities are equal Volume used from original solution, ml 5 10 20 Solution A B Solution A* B C D Acetic ac mol L 0.0000351 0.10 0.010 0.10 0.15 * Use quadratic formula: [Acetic acid, mol L 0.0000351 0.10 0.010 0.10 0.15 Determine the volume of the stock solutions of 1.00-mol Lacetic acid and 1.00-mol L of sodium acetate needed to prepare the solutions. Write your answer in the table below. ax²+bx+c = 0 Final volume, ml 0.010 0.10 100 100 100 0 0.10 Acetate, mol L Final volume, ml. 100 100 0.010 0.15 0.10 b. Calculate for the initial pH of the solutions and write the pH in the table below. [Acetic acid, mol L [Acetate), mol L 0.0000351 0.10 0 0.10 C Which solution(s) have the same pH? Vol. acetic acid, Acetate, mol Vol. of ecstate, mL mL d. Which solution is closest to the pK,? L¹ 0 0.10 0.010 0.15 0.10 -bv-400 20 100 100 100 0.010 0.15 https://www.calculatorsoup.com/calculators/algebra/quadratic-formula calculator.pho Finel volume, mL 100 100 100 100 100 Initial pH
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