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?© BrainMass Inc. brainmass.com March 4, 2021, 8:23 pm ad1c9bdddf
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 ...
It shows how to find the molarity and molality of H3PO4 given its mass percent.