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500. mL of 1.5 M H3PO4 is needed for an experiment. Determine the volume of concentrated phosphoric acid necessary to be diluted to 500. ml

500. mL of 1.5 M H3PO4 is needed for an experiment. Determine the volume of concentrated phosphoric acid necessary to be diluted to 500. ml in order to obtain an analytical concentration of 1.5 M. (Concentrated phosphoric acid possess a specific gravity of 1.71 and contains 86% H3PO4 (formula weight 97.99) by weight.

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