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In: Chemistry

Which of the following buffers would be the best choice for a desired pH of 3.0:...

  1. Which of the following buffers would be the best choice for a desired 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

  1. A buffer (1L total volume) contains 0.15 moles ammonia and 0.25 moles ammonium chloride (pKa=9.26). What is the pH of that buffer solution? What is the pH after 0.0025 moles of KOH are added?

  1. Which of the following makes the best buffer (assume equal volumes):
  1. 0.1 M HNO3 and 0.1 M LiOH
  2. 0.1 M acetic acid (Ka = 1.8E-5) and 0.1 M NaOH
  3. 1M acetic acid (Ka = 1.8E-5) and 0.0001 M sodium acetate
  4. 0.1 M acetic acid and 0.1 M sodium acetate
  1. When adding strong base to a buffer, which component of the solution is reacting with that strong base? Draw the reaction using HA for the weak acid and A- for the weak base.

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Expert Solution

queen_honey_blossom answered 1 year ago
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