1 A balance is checked and found to be accurate and clean Af

1. A balance is checked and found to be accurate and clean. After the lab, a spilled white solid is found on the balance. The only white substances available in the lab were barium chloride and sodium sulfate. Outline a procedure to determine which of the solids has been spilled. Why is it important to know which of the 2 solids is on the balance before the spill is cleaned up?

2. Some dust from a shoe print at a crime scene is dissolved in nitric acid and analyzed. The flame test is inconclusive, yielding a brick orange flicker followed by more yellow long--lasting flame, but the dust sample yields a white precipitate when heated with ammonium oxalate. The silver nitrate test is negative with no precipitate forming, but a follow up barium chloride test yields an insoluble precipitate. From this data, the investigator concludes tht trces of gympsum are on the shoes and the wearer of the shoes has had a recent association with some type of construction or building supply. Gypsum is a major component of many dry wall products. From the above lab data, what are the names and formulas of the 2 ions present in gypsum.