Goal:
To observe what happens when seltzer tablets are placed in cold and hot water.
Materials:
- 2 small clear plastic cups
- 2 seltzer tablets
Procedures:
1. Prepare cold water by placing several ice cubes in one cup of water.
2. Pour cold water into a plastic cup and have your child draw the cup and water in the space labeled A on the Bubble Bubble Data Sheet.
3. Drop a seltzer tablet in the cold water and watch what happens.
4. Invite your child to draw what happened in the space labeled 6 on the data sheet.
5. Record your child’s observations about the investigation on the back of the data sheet.
6. Repeat steps 2-5 using one cup of hot tap water instead of cold water. Have your child make “before and after” drawings in the spaces labeled C and D and record his or her observations.
Questions to Ask:
- What happened when we dropped the first tablet in the cold water?
- Where do you think the bubbles went?
- What was the difference when we used hot instead of cold water? (Action of bubbles is louder and faster.)
- Describe any odor you noticed. (You may notice a medicinal smell.)
Additional Investigations:
- Try dissolving seltzer tablets in other liquids, such as soft drinks, vinegar, or fruit juice.
- Place a tablet in a plastic zipper bag, add a small amount of water, seal the bag, and watch what happens.
- See how long it takes to dissolve tablets in water of varying temperatures.
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