Hello again. This Instructable takes puts a Halloween spin on a classic grade- school science project- The Baking Soda Volcano. How does the oldest "chemistry" project in the book relate to Halloween? Keep reading to find out.
Step 1: Materials
First, gather materials, including:
- Contigo Autospout Water Bottle (Amazon)
- 2 cups Vinegar
- 1 cup water
- 2 Alka Seltzers
- Orange Food Coloring
- 5 Minutes of Spare Time on Halloween
Step 2: Assemble
First, pour the vinegar, water, and 2-3 drops of food coloring into the water bottle. Stir well. Close the water bottle and put the alka seltzer near it.
Step 3: Use
Now it's time for the fun part. When you are ready to spray, just drop the alka seltzer into the contigo water bottle and put the lid on very quickly. When you are ready to use, just aim (at friends who won't get mad, not strangers) and click the button on the bottle.
Step 4: The Chemistry
Now let's examine the chemical reaction on a molecular level. This is what's really happening :
Alka Seltzer (Sodium Bicarbonate- NaHCO3) + Vinegar (Acetic Acid, Water- CH3COOH, H2O) = Carbon Dioxide (CO2).
In other words, the Alka Seltzer (a basic substance) and the Vinegar (an acid liquid) combine to make carbon dioxide (the fizz in your soda), which creates pressure in the bottle. That pressure, along with mixture, releases when you click the button.
*Note: See my Instructable about Water.
Step 5: Watch the Video
*Note: I was slightly impatient when I made this video, so the intensity of the spray is less than I desired. If I had waited 30 seconds longer, it would have been very impressive (unless you were getting sprayed).