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    molarity and molality of H3PO4

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    A typical commercial-grade phosphoric acid is 75% H3PO4, by mass, and has density d= 1.57 g/mL. What are the molarity and molality of H3PO4 in this acid?

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    Solution Preview

    Assume there are 1000 g of acid solution, the concentration of phosphoric acid is 75% by mass. so the mass of phosphoric acid is
    m = 1000 * 75% = 750 g.

    the density of the solution is ...

    Solution Summary

    It shows how to find the molarity and molality of H3PO4 given its mass percent.