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molarity and molality of H3PO4

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?

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.

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