0.4 M PO4 Buffer Solution

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0.4 M PO4 Buffer Solution
(makes 500 ml)

5.25 g NaH2PO4 * H2O
43.3 g Na2HPO4 * 7H2O (or 22.94 g Na2HPO4)
500 ml ddH2O

Adjust pH to ~ 7.4.

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