Reaction In A Bag

Topics: Sodium bicarbonate, Calcium carbonate, Chemistry Pages: 4 (523 words) Published: November 9, 2014
Reaction in a Bag
Purpose
To see evidence of a chemical reaction and explore different variables in the experiment. Research
Research practical use of sodium bicarbonate, NaHCO3. used as an antacid to treat acid indigestion and heartburn

Research practical use of calcium chloride, CaCl2.removing things like ice

Define a chemical reaction. a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

Contrast exothermic and endothermic reaction. Endothermic means that heat is released while exothermic means heat is conducted

Description
Equal volumes of anhydrous calcium chloride and sodium bicarbonate are placed in a sealable plastic bag. Aqueous phenol red is added, the bag is sealed, and the ensuing reaction is observed.

Hazards
Phenol red causes stains.

Precautions
Wash spills immediately with large amounts of water.

Materials
CaCl2 ( calcium chloride)
NaHCO3 ( sodium bicarbonate also known as baking soda)
sealable plastic bag (e.g., Ziploc® bag)
0.1 % aqueous phenol red
1 vial (small test tube)
Two plastic spoons
Procedure
1. Open a sealable plastic bag.
2. Hold the bag so that the center of the bottom of the bag is tucked up and the two bottom corners are readily accessible. 3. Place a teaspoon of NaHCO3 in one bottom corner. Place a teaspoon of anhydrous CaCl2 in the other corner (right of movie). 4. Place a vial of phenol red solution in the bag. Seal the bag really well without mixing the solids or spilling the solution. 5. Tilt the vial so that half of the phenol red solution is poured over the first solid. Mix by squeezing gently. Observe. 6. Tilt the vial so that half of the phenol red solution is poured over the second solution. Mix by squeezing gently. Observe. 7. Now tilt so that the solutions come in contact with each other. Mix again. Observe. 8. Note evidence for reaction.(three observations support evidence of...
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