Phosphoric acid is prepared by dissolving phosphorus (V) oxide, P4O10, in water. What is the balanced equation for this reaction? How many grams of P4O10 are required to make 1.50 L of aqueous solution containing 5.00% phosphoric acid by mass? The density of the solution is 1.025 g/mL.

Answer 1

The balanced equation for this reaction is:
P4O10 + 6H2O → 4H3PO4

The number of grams of P4O10 required to make 1.50 L of aqueous solution containing 5.00% phosphoric acid by mass is:

1.50 L x 1.025 g/mL x 0.05 = 7.875 g