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Goal- to make a 1L solution of phosphate buffer at pH 7.8 If you make up...

Goal- to make a 1L solution of phosphate buffer at pH 7.8

If you make up a 1M aqueous solution each of: NaH2PO4 and Na2HPO4

How much of each solution would you need to add (mix) to make up a 1 liter solution of 0.4 M phosphate at pH 7.8

Hint: the pKa for H2PO4- <-> HPO4 2- + H+ is 6.8)

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