Students will test baking soda in different solutions to determine the different types of chemical reactions that may occur.
Safety: All students wear goggles all of the time. Thermometer is breakable (Be Careful!)
All materials can go down the drain.
Gather your supplies:
Dry Erase Marker
5 mL (1tsp) Baking Soda (NaHCO3)
5 mL Vinegar
5 mL Lemon Juice
Bromothymol Blue Indicator (teacher will distribute)
5 mL Water
Use all of your senses except NO TASTING! Remember to whaff the smell toward you.
What changed? Color, Temperature, Appearance(bubbling, cloudy, etc.), Smell?
1. Measure 5 mL of water and put into the first cup of tray. Use your dropper to help measure accurately.
2. Place your thermometer into the water and record the temperature.
3. Add ¼ of your baking soda (1/4 tsp) into the water, stir with the back end of spoon. Leave the thermometer in the solution to see if the temperature changes.
4. Record any changes that took place (use the list above to help you, keep in mind chemical reactions can happen very quickly.)
5. Repeat steps 1-4 in the 2nd cup of tray only using vinegar instead of water.
6. In the 3rd cup of tray, place a few drops of Bromothymol Blue Indicator.
7. Take the temperature of the Indicator and record.
8. Add a small amount of baking soda to the indicator and observe what happens.
7. Record any changes that took place.
8. Repeat steps 1-4 in the 4th cup of tray using lemon juice instead of water.
9. In the final cup of tray you can mix any of the mixtures you have already used to see if anything else happens.
10. Write what was mixed and record what happened.
Combinations: Baking Soda Baking Soda Baking Soda Baking Soda
Water Vinegar Indicator Lemon Juice