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.