- Which of the following buffers would be the best choice for adesired pH of 3.0:
           a. Acetic acid (pKa=4.74)
           b. HF (pKa= 3.14)
           c. Carbonic acid (pKa=6.37)
           d. Propanoic acid (pKa=4.85)
           e. Not enough information is given
- A buffer (1L total volume) contains 0.15 moles ammonia and 0.25moles ammonium chloride (pKa=9.26). What is the pH of that buffersolution? What is the pH after 0.0025 moles of KOH are added?
- Which of the following makes the best buffer (assume equalvolumes):
- 0.1 M HNO3 and 0.1 M LiOH
- 0.1 M acetic acid (Ka = 1.8E-5) and 0.1 M NaOH
- 1M acetic acid (Ka = 1.8E-5) and 0.0001 M sodiumacetate
- 0.1 M acetic acid and 0.1 M sodium acetate
- When adding strong base to a buffer, which component of thesolution is reacting with that strong base? Draw the reaction usingHA for the weak acid and A- for the weak base.
