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Your Safer Source for Science
Address P.O. Box 219 Batavia, IL 60510
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Item #: PF2079 

Price: $110.00

Performance Assessment

In this lab experience, students evaluate how different concentrations of hydrochloric acid affect the time it takes to dissolve calcium carbonate then draw conclusions on how this relates to calcifying organisms and ocean acidification. Ocean acidification and its impact on the human population can be difficult for students to understand. It is something that happens on a large scale and over an extended period of time. When measured against the human lifespan, it always seems like a distant problem. But on a geological timeframe, it is occurring quite rapidly. Though this lab, students will come to understand the effect of carbon dioxide on the ocean feedback mechanism. As levels of carbon dioxide in the atmosphere continue to rise, more of that gas is being absorbed by the ocean. The ocean buffering system is driven more toward the acidic side, lowering the ocean pH. Rising carbon dioxide levels in the atmosphere are directly harming the ocean ecosystems through ocean acidification, which is interfering with many organisms’ ability to form shells. Students will see that higher concentrations of acid have a stronger effect on shell material and will be able to understand the effects this has on the ocean’s buffering system and the organisms living within.

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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 carbonate (marble chips) 70 g
Hydrochloric acid solution, 6 M, 250 mL
Hydrochloric acid solution, 2 M, 200 mL
Petroleum jelly, foilpacs, 10

Syringes, 60 mL, 10
Syringe adapters, 10
Stopper, one-hole, #5, 10

Additional Materials Required
Bottles, Washing, Polyethylene, 250-mL, 10
Flask, Erlenmeyer, Borosilicate Glass, 125 mL, 30
Flinn Scientific Electronic Balance, 120 x 0.001-g, 10
Single Buret Clamp, Plain Jaw, 10
Stopcock Grease, Silicone, 10
Student Timer, 12-pack, 1
Support Stand, Economy Choice, 10