How to make Phosphate Buffered Saline, pH 7.4 & pH 3.0

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bansheep
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How to make Phosphate Buffered Saline, pH 7.4 & pH 3.0

Materials
NaH2PO4*2 H2O
Na2HPO4*2 H2O
NaCl

How to make 0.05M pH 7.4 and 0.02M pH 3.0 PBS ???