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 Volume used from original solution, mL Final volume, mL 1 5 100 2 10 100 3 20 100 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] ☐ [Buffer 3] > [Buffer 2] > [Buffer 1] ☐ [Buffer 3] = [Buffer 2] = [Buffer 1] ☐ [Buffer 3] = [Buffer 2] > [Buffer 1] ☐ [Buffer 3] > [Buffer 2] = [Buffer 1] 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]
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 Volume used from original solution, mL Final volume, mL
1 5 100
2 10 100
3 20 100
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]
☐ [Buffer 3] > [Buffer 2] > [Buffer 1]
☐ [Buffer 3] = [Buffer 2] = [Buffer 1]
☐ [Buffer 3] = [Buffer 2] > [Buffer 1]
☐ [Buffer 3] > [Buffer 2] = [Buffer 1]
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]
d. Which of the following is true about the ability of the three buffers to resist pH change when 1 mL
of HCl is added to each buffer? Check the box corresponding your answer.
☐ 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
e. Which solution has the highest buffer capacity? Check the box corresponding your answer.
☐ Buffer 1
☐ Buffer 2
☐ Buffer 3
☐ Their buffer capacities are equal
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