A 1.336-g sample of commercial contaminated by was dissolved in water, and the resulting solution was diluted to 500.0 mL. A 50.00-mL aliquot of this solution was treated with 40.00 mL of 0.05304 M and boiled to remove . The excess acid consumed 4.97 mL of 0.04809 M (phenolphthalein indicator). An excess of neutral was added to another 50.00-mL aliquot to precipitate the carbonate as . The solution was then titrated with 28.56 mL of the acid to a phenolphthalein end point. Calculate the percentage , , and in the sample, assuming that these are the only compounds present.