Question

1. Exactly 0.2220 g of pure Na2CO3 was dissolved in 100 mL of 0.0731 M HCl. a) What is mass in grams of CO2 were evolved? (5p) b) What was the molar concentration of the excess reactant (HCl or Na2CO3)?

Answer 1

A 1.42-g sample of a pure compound with formula M2SO4 was dissolved in water and treated with and treated with an excess of aqueous calcium chloride, resulting in the precipitation of all the sulfate ions as calcium sulfate. The precipitate was collected, dried, and found to weigh 1.36