Sulfate (SO2) is typically determined by dissolving in H₂O followed by precipitation as BaSO4 via addition of BaCl₂. Calculate the percent (w/w) Na2SO4 (FW-142.04) in an unknown sample based on the data below? What percent SO, (FW-80.06) is in the unknown sample? Constant weight of crucible: 25.6390 g Weight of vial with solid unknown sample: 13.1131 g Weight of vial minus some sample: 12.4122 g Weight of crucible + BaSO4 after 1" heating (ignition): 25.9365 g Weight of crucible + BaSO4 after 2nd heating (ignition): 25.9348 g Weight of crucible +BaSO, after 3rd heating (ignition): 25.9347 g

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