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February 2006, Issue #46
JETS Hands-On!
Make your own Soda Pop
Brought to you by:
National Academy of Engineering
EngineerGirl Website
www.engineergirl.org
Ingredients
1/8 Teaspoon of Yeast
2 ¼ cups of Sugar
Water
1 Tablespoon and 1 Teaspoon of Flavoring Syrup
Step One
Add 1/8 of a teaspoon of yeast to a coffee cup full of water to dissolve.
The water should be kept between 98-110 degrees Fahrenheit so it doesn't kill the yeast. Let the yeast dissolve for about 5 minutes.
Step Two
In a 1 gallon jug mix together dissolved yeast, 1 tablespoon and 1 teaspoon of
flavoring syrup, and 2 1/4 cups of sugar. Fill the remainder of the jug with lukewarm water, then cap the jug and mix the ingredients until fully dissolved.
Step Three
Let the capped bottle sit for about 10 days to carbonate. You can check the carbonation by squeezing the sides of the bottle; the harder it is to squeeze the more carbonation there is. If it is extremely carbonated, let some off by opening the cap. You can sample the soda to determine when the proper carbonation has been achieved. Also, if the soda is left for too long the possibility of complete fermentation exists. Regardless, the mixture may smell of yeast.
How is this Engineering?
When your soda carbonates, the yeast reacts with the sugar to create carbon dioxide, which dissolves in the water. This dissolved carbon dioxide is the carbonation.
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