0.1M Na2HPO4 and 0.2MNaH2PO4.How much stock solutions and H2O would be needed to prepare 0.5M,2L of phosphate buffer at pH7.4?(pKa fr H2PO4 :7.2) can you guide me through it? i don't understand how this should be done.thanks Read answer

0.1M Na2HPO4 and 0.2MNaH2PO4.How much stock solutions and H2O would be needed to prepare 0.5M,2L of phosphate buffer at pH7.4?(pKa fr H2PO4 :7.2) can you guide me through it? i don't understand how this should be done.thanks
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