Explain what is the number of grams of nah2po4

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What is the number of grams of NaH2PO4 which are needed to react with 43.74 mL of 0.285 M NaOH? NaH2PO4 (S)+ 2NaOH(aq) ----> Na3PO4 (aq)+ 2H2O (l)

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