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Question: Do different medicinal teas affect yeast fermentation, measured by how much gas (CO₂) fills a balloon?
Procedure:Boil water, steep each tea bag for 5 minutes, then let the tea cool to room temperature.
- Boil water, steep each tea bag for 5 minutes, then let the tea cool to room temperature.
Label bottles for each tea and a plain water control.
- Label bottles for each tea and a plain water control.
Add 100 mL of each tea (or water) to the bottles.
- Add 100 mL of each tea (or water) to the bottles.
Add 1 teaspoon of sugar to each bottle.
- Add 1 teaspoon of sugar to each bottle.
Dissolve a small amount of yeast in a little warm water and add it to each bottle with sugar.
- Dissolve a small amount of yeast in a little warm water and add it to each bottle with sugar.
Stretch a balloon over each bottle’s opening.
- Stretch a balloon over each bottle’s opening.
Watch as the yeast produces gas, inflating the balloon.
- Watch as the yeast produces gas, inflating the balloon.
After a few hours, measure the balloon’s size to see which tea produced the most or least gas.
- After a few hours, measure the balloon’s size to see which tea produced the most or least gas.
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