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Experiment 1.1
Heating Baking Soda
Cautions
Always wear safety glasses when you use a burner or work with gases.
Purpose:
What do you think will happen if you heat some baking soda in a test tube? Will the baking soda change color? Will anything leave the test tube?
Materials:
pegboard
small clamps
burner
no. 2 one hole stopper
right-angle bend
stirring rod
soda bottle
test tube rack
scoopula
water
baking soda
tea
safety glasses
plastic container
Procedure:
1. Set up your lab the same as pg. 2, figure 1.1.
2. Put about .5 cm of baking soda into a test tube.
3. Have teacher check your set up.
4. Heat baking soda over a microburner.
5. Watch the test tube and collecting bottle as the baking soda heats up. Make observations.
What do you observe at the bottom of the test tube?
Does a gas collect in the inverted bottle?
6. When nothing new is happening, take the rubber hose out of the bottle and then turn off the burner.
Caution:
Do not blow out the flame!
Turn off the gas!
7. Compare the amount of air in your collection bottle with the picture on page 4.
From where, do you think, did the gas come?
From where did the droplets on the test tube come?
8. Place a small amount of baking soda in tea. Shake gently.
9. Place a small amount of the new substance in tea. Shake gently.
Is the color of the liquid in the two test tubes the same?
If the color is different, can the white powder in the test tube that you heated still be baking soda? Why or why not.
How can you compare the amounts of solid, liquid, and gas that you observed?
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