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Which of the following weak acids is best used to prepare a buffered solution with a desired pH= 4? ) 1. 2. 3. 4.

Which of the following weak acids is best used to prepare a buffered solution with a desired pH= 4? ) 1. 2. 3. 4. 5. Acetic acid (pKa= 4.76) Barbituric acid (pKa= 3.97) Benzoic acid (pKa= 4.2) Boric acid (pKa= 9.2) None of the above

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