2. Explain why the pH of buffer solution #1 from Part 1 did or did not change significantly after Formulate your argument using the Henderson- it was diluted with 30 mL of water. Hasselbalch equation.

2. Explain why the pH of buffer solution #1 from Part 1 did or did not change significantly after Formulate your argument using the Henderson- it was diluted with 30 mL of water. Hasselbalch equation.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter9: Aqueous Solutions And Chemical Equilibria

Section: Chapter Questions

Problem 9.29QAP

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Question

2. Explain why the pH of buffer solution #1 from Part 1 did or did not change significantly after

Formulate your argument using the Henderson-

it was diluted with 30 mL of water.

Hasselbalch equation.

Buffer
Solution
#1
Volume of
0.1 M
NH3(aq)
45 mL
millimoles
of NH3(aq)
4.5
Volume of
0.1 M
NH4Cl
15 mL
millimoles
of NH4Cl
105
Calculated
pH
9.73 9.67
Measured
pH

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You have a solution of the weak acid HA and add some of the salt NaA to it. What are the major species in the solution? What do you need to know to calculate the pH of the solution, and how would you use this information? How does the pH of the solution of just the HA compare with that of the final mixture? Explain.
Ammonia gas is bubbled into 275 mL of water to make an aqueous solution of ammonia. To prepare a buffer with a pH of 9.56, 15.0 g of NH4Cl are added. How many liters of NH3; at 25C and 0.981 atm should be used to prepare the buffer? Assume no volume changes and ignore the vapor pressure of water.
A chemist needs a buffer with pH 3.50. How many milliliters of pure formic acid (density = 1.220 g/mL) must be added to 375 mL of 0.0857 M NaOH solution to obtain such a buffer?
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A good buffer generally contains relatively equal concentrations of weak acid and conjugate base. If you wanted to buffer a solution at pH = 4.00 or pH = 10.00, how would you decide which weak acidconjugate base or weak baseconjugate acid pair to use? The second characteristic of a good buffer is good buffering capacity. What is the capacity of a buffer? How do the following buffers differ in capacity? How do they differ in pH? 0.01 M acetic acid/0.01 M sodium acetate 0.1 M acetic acid/0.1 M sodium acetate 1.0 M acetic acid/1.0 M sodium acetate
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