Procedure
- Label two 100-mL beakers “calcium chloride” and “sodium bicarbonate,” respectively fill each beaker about one-half full with the appropriate solid
- Obtain both a teaspoon and tablespoon scoop to dispense the sodium bicarbonate and calcium chloride, respectively
- Store the scoops in their respective beakers (Make sure that each scoop is only used with the same chemical it originally contacted)
- Obtain 40 mL each of phenol red and distilled water in separate, labeled, 50-mL beakers
- Use a 10-mL graduated cylinder or pipet to dispense the liquids as needed in the following steps
- Be sure to rinse the cylinder with distilled water after using the phenol red indicator before using it again
- Lay a plastic bad flat on the table
- Place 1 TBSP of calcium chloride, 1 tsp of baking soda and 10mL of phenol red indicator in separate locations inside the bag
- Push out excess air and seal the bag before mixing the contents thoroughly
- Students are now able to observe the reaction and feel the bag as it warms up
- If gas builds up, open the bag slightly away from the faces of anyone nearby
- Rinse with water for cleanup
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