medium · MCAT chem-phys
A laboratory technician needs to prepare a buffer at pH 5.0.
Which of the following weak acids would be the most effective choice as the starting material?
- Acetic acid (pK_a = 4.76)
- Ammonium ion (pK_a = 9.25)
- Nitrous acid (pK_a = 3.30)
- Propanoic acid (pK_a = 4.87)
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