Take some fruit juice or sugar solution and add some yeast to this. Take this mixture in a test tube fitted with a one-holed cork.
Fit the cork with a bent glass tube. Dip the free end of the glass tube into a test tube containing freshly prepared lime water.
What change is observed in the lime water and how long does it take for this change to occur?
- ✅ Answer: Air taken out through the tube makes lime water milky.
What does this tell us about the products of fermentation?