Question: You are asked to make a buffer with a pH value close to 4 that would best resist an increase in pH. You can select

You are asked to make a buffer with a pH value close to 4 that would best resist an increase in pH. You can select one of the following acid–conjugate base pairs: acetic acid–acetate, Ka = 1.8 x 10-5; ammonium ion–ammonia, Ka = 5.6 x 10-10; or benzoic acid–benzoate, Ka = 6.3 x 10-5; and you can mix them in the following acid–conjugate base ratios: 1:1, 2:1, or 1:2. What combination would make the best buffer?

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