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The following reagents are available: Reagent 1: pKa = 5 Reagent 2: pKa = 6.75 Reagent...

The following reagents are available:

Reagent 1: pKa = 5

Reagent 2: pKa = 6.75

Reagent 3: pKa = 7.5

Reagent 4: pKa = 8.25

If a buffer with pH = 7.25 is to be prepared, which two reagents would be best?

Please explain.

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Thank you vmuch....

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