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Item #: PF2083 

Price: $40.00

In this lab experience, students explore the chemistry of calcium carbonate formation in saline solutions resembling seawater and investigate how the acidity of the solution and the presence of carbonate or bicarbonate ions affects the formation of calcium carbonate. Students then establish relationships between experimental models, the process of ocean acidification and the formation of calcium carbonate structures by marine organisms. Mixing calcium chloride (CaCl2) and sodium carbonate (Na2CO3) in a sodium chloride (NaCl) solution will cause the precipitation of calcium carbonate (CaCO3), a white solid. Upon mixing of CaCl2 and sodium bicarbonate (NaHCO3), also in a NaCl solution, an amount of CaCO3 will precipitate, but not as much as in the reaction with Na2CO3. Adding HCl to CaCO3 will cause partial solubilization of the solid. Students will correlate these chemical processes with the effect of ocean acidification on CaCO3 formation by marine organisms.

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Product Details

Safety: Before conducting the lab, review the safety precautions on the student page with the class. Then discuss any safety precautions that are specific to your science laboratory or classroom.

Materials Included in Kit

Calcium chloride, 25 g
Hydrochloric acid solution, 3.0 M, 50 mL
Sodium bicarbonate, 20 g
Sodium carbonate, 20 g
Sodium chloride, 75 g
Pipets, 100
Weighing dishes, 20

Additional Materials Required
Beakers, Borosilicate Glass, 400 mL, 10
Centrifuge, 1
Cylinder, Borosilicate Glass, 10 mL, 10
Cylinder, Borosilicate Glass, 100 mL, 10
Spatulas, Disposable, Box of 300, 1
Stirring Rods, Glass, 10
Test Tubes without Rims, Borosilicate Glass, 16 x 150 mm, 20.0 mL, 100
Wax Pencil Set, Heat Resistant, 4
Wire Test Tube Rack, No Coating, 22 mm Tubes, 20 Places, 10