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Item #: PF2037 

Price: $30.00

Performance Assessment

In this lab experience, students determine the empirical formula of an unknown copper carbonate by using a mass-loss approach to determine the percent by mass of CO2 and a colorimetric approach to determine the mass percent of Cu. Students must be proficient with topics, such as the mole, molar mass, molarity, percent composition and empirical formulas. Students determine the experimental mass percents of CO2 and Cu in a sample of copper carbonate of unknown composition. Students compare their experimentally determined mass percents to the theoretical mass percents, calculated from two potential empirical formulas, to determine the true formula of the sample under investigation.

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Product Details

Safety: Remind students that hydrochloric acid solution is toxic and corrosive to eyes and skin tissue, and that copper carbonate is slightly toxic by ingestion and inhalation. Students should wear chemical splash goggles, chemical-resistant gloves, and a chemical-resistant apron. Remind students to wash hands thoroughly with soap and water before leaving the laboratory, and to follow all laboratory safety guidelines.

Materials Included in Kit

Basic copper carbonate, 50 g
Copper(II) sulfate,pentahydrate, 25 g
Hydrochloric acid solution, 2 M, 300 mL
Sulfuric acid solution, 0.5 M, 120 mL
Pipets, Beral-type, 40
Weigh dishes, 20

Additional Materials Required
Cylinder, Borosilicate Glass, 10 mL, 10
Cylinder, Borosilicate Glass, 25 mL, 10
Flask, Erlenmeyer, Borosilicate Glass, 125 mL, 10
Flinn Scientific Electronic Balance, 210 x 0.01-g, 10
Reaction Plates, 24 Wells, 10
Test Tubes without Rims, Disposable, 13 x 100 mm, Pkg. of 250, 70
Test Tube Rack, Economy Choice, 10