# chem

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Cola contains H3PO4. In order to determine the concentration of phosphoric acid in 50.0 mL of cola, a precipitation reaction with excess silver nitrate was carried out. The product, silver phosphate, was dried and found to weigh 0.0576g. What is the concentration of phosphoric acid in the cola?

• chem -

0.0576 g Ag3PO4 = how many moles.
moles = g/molar mass.

1 mol Ag3PO4 contains how many moles of PO4^-3?

1 mol PO4^-3 is equivalent to how many H3PO4 moles?

Convert moles H3PO4 to grams and divide by 50 mL to obtain g H3PO4/mL or multiply that by 100 to convert to %.

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