You want to make your own buffer solution with a desired pH of 4.2. The systems available to use are:  System 1: pKa = 4.9 System 2: pKa = 7.2 System 3: pKa = 6.2 Which System would be the most appropriate to use and why?

Chemistry: Principles and Reactions
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ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter14: Equilibria In Acid-base Solutions
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Problem 54QAP: Ammonia gas is bubbled into 275 mL of water to make an aqueous solution of ammonia. To prepare a...
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You want to make your own buffer solution with a desired pH of 4.2. The systems available to use are: 

System 1: pKa = 4.9

System 2: pKa = 7.2

System 3: pKa = 6.2

Which System would be the most appropriate to use and why?

 

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I still do not understand , mathematically, why this is the system we should use and how it is correct.

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