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Your Safer Source for Science
Address P.O. Box 219 Batavia, IL 60510
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Item #: PF2065 

Price: $115.00

In this lab experience, students investigate the three main sources of anthropogenic carbon emissions: combustion, land-use/deforestation and cement production. They also develop a model to describe the cycling of carbon among the hydrosphere, biosphere, geosphere and atmosphere and learn that matter, such as the C atoms in CO2, cannot be created or destroyed, only converted from one form to another. In Part A, students combust a hydrocarbon (a candle) and observe that the CO2 produced is absorbed by a solution of basic water and phenolphthalein, because the solution turns from pink to colorless as the H2CO3 produced lowers the pH. In Part B, students see that an Elodea sprig in water exposed to light reduces the concentration of dissolved CO2 and thus raises the pH. Students use bromthymol blue to observe indirectly the conversion of dissolved CO2 to glucose. In Part C, students heat a metal carbonate to its decomposition temperature to simulate the curing of concrete. When students heat the metal carbonate they observe indirectly the production of CO2 because it changes the color of an aqueous acid–base indicator owing to the formation of H2CO3.

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Product Details

Safety: Remind students that sodium hydroxide solution is a skin and eye irritant and is slightly toxic by ingestion; phenolphthalein solution is a flammable liquid and is toxic by ingestion and inhalation; and copper(II) carbonate is slightly toxic by ingestion and inhalation. Also remind students to turn off the hot plate immediately after demonstration to avoid burns or hot plate damage; and to wear chemical splash goggles, chemical-resistant gloves, and a chemical-resistant apron.Students should wash hands thoroughly with soap and water before leaving the laboratory.

Materials Included in Kit

Bromthymol blue solution, 500 mL
Copper(II) carbonate, 50 g
Phenolphthalein indicator solution, 1%, 100 mL
Sodium hydroxide solution, 0.1M, 150 mL
Candles, 10

Ointment-style glass jars with lids, 18
Wine airlock, 6

Additional Materials Required
Beakers, Borosilicate Glass, 50-mL, 10
Beral Pipets, Extra-Large Bulb, Pkg. of 20, 10
Butane Safety Lighter, 10
DLAB Classic Magnetic Stirrer/Hot Plate, 10
Elodea (Anacharis), Live, Pkg. of 12, 1
Flask, Erlenmeyer, Borosilicate Glass, 250 mL, 10
Magnetic Stirring Bar, 2" x 5/16", 10
Rubber Stoppers, 1 lb, Size #6, Black, One-Hole, 1