Buffer Capacity (College)
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Buffer Capacity
Instructions: The following questions require the use of a calculator.
1.
Which of the following correctly defines a buffer?
- A solution that resists changes in pH when an acid is added
- A solution that resists changes in pH when a base is added
- A solution that allows changes in pH when an acid or a base is added
- A solution that resists changes in pH when an acid or a base is added
2.
Which of the following correctly defines buffering capacity?
- The amount of protons a buffer can absorb without a change in pH
- The amount of hydroxide ions a buffer can absorb without a change in pH
- The amount of protons or hydroxide ions a buffer can absorb without a change in pH
- None of the above
3.
Which of the following equations represents the pH of the buffer?
- [math][HA]/[A^-][/math]
- 1
- [math][HA], only[/math]
- [math][A^-]/[HA][/math]
4.
At which of the following values for the pH of the buffer does optimal buffering occur?
- <1
- 2
- >2
- 1
5.
Which of the following represents a viable buffer?
- HCl and its salt
- NaOH and its salt
- Ammonia and its salt
- None of the above
6.
Which of the following does NOT represent a viable buffer solution?
- Citric Acid/Sodium Citrate
- Boric Acid/Borax
- Carbonic Acid/Sodium Hydrogen Carbonate
- None of the above
7.
Which of the following equations can be used to calculate the concentration of hydrogen ions in a buffer solution?
- [math][H^+] = K_a xx [[HA]]/[[A^-]][/math]
- [math][H^+] = K_a xx [[A^-]]/[[HA]][/math]
- [math][H^+] = {K_a xx [A^-]}/{[A^-] xx[HA]}[/math]
- None of the above
8.
Which of the following correctly represents the equation used to calculate the pH value of the buffer, based on the [math]K_a value[/math]?
- [math]pH=pK_a+{log} [[A^-]]/[[HA]][/math]
- [math]pH=pK_a-{log} [[A^-]]/[[HA]][/math]
- [math]pH=pK_a+{log} [[HA]]/[[A^-]][/math]
- [math]pH=pK_a-{log} [[HA]]/[[A^-]][/math]
9.
If [math]K_b=1.81xx10^-5[/math] and a solution contains 6.00 mol of ammonia and 4.00 mol of ammonium chloride, determine the pH value of this solution.
10.
If [math]K_a=1.8xx10^-5[/math] for a buffer solution containing acetic acid, [acetate]=1.2 M, and [acetic acid]=0.82 M, determine the pH value of the buffer solution.
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