Chemistry

posted by Christine

You have the following acids and their conjugate bases available:
Acetic Acid: CH 3COOH/CH3COO-; Ka = 1.8 × 10-5
Carbonic Acid: H2CO3/HCO3-; Ka = 4.2 × 10-7
Hydrofluoric acid: HF/F-; Ka = 7.2 × 10-4
Which of these acid/conjugate base pairs would be the best choice for a buffer in the range of pH 4.5?

a. acetic acid
b. carbonic acid
c. hydrofluoric acid

I believe B. Please help.

  1. Christine

    i think the answer is A because it's pKa is the closest to pH 4.5.

  2. DrBob222

    B is wrong. A is right. Typically you want to pick pKa withing +/- 1 of the desired pH.

  3. Jameson

    Christine! Are you doing AP Chem with k12?

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