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

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

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?

Which of the following makes the best buffer (assume equal volumes):

0.1 M HNO₃ and 0.1 M LiOH
0.1 M acetic acid (K_a = 1.8E-5) and 0.1 M NaOH
1M acetic acid (K_a = 1.8E-5) and 0.0001 M sodium acetate
0.1 M acetic acid and 0.1 M sodium acetate

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.

Solutions

Expert Solution

queen_honey_blossom answered 8 months ago

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