Lab Report
1. Title:
Ethanol Fermentation Experiment
2. Statement of the Problem:
How can you make ethanol from yeast?
* The Process of making ethanol from yeast is a simple process that requires
inexpensive and common household materials.
3. Hypothesis(s)/Null Hypothesis(s): "My hypothesis is that the experiment will
work because we have looked over the experiment and it’s facets and examined
each of the possibilities that commonly occur from this experiment and we have
come to the conclusion that it will work."
"My null hypothesis is that the experiment will NOT work because the yeast wasn’t
kept at the correct environment and became inactive. Therefore rendering the
experiment to a failure and unable to create ethanol.”
* Make sure this possible solution is a complete sentence.
* Make sure the statement is testable, an if-then statement is recommended to
illustrate what criteria will support your hypothesis (and what data would not
support the hypothesis).
4. Materials:
1. 1 pound bag of Sugar
2. Water: 100 mL
3. Yeast: 0.5 g per experiment
4. 500 mL Beaker
5. Coffee filter papers
6. Permanent Black Marker Pens
7. Limewater
8. Measuring cylinder
5. Procedure:
● Put 25 mL of glucose in the conical flask and add 50 cm3 of warm water.
Swirl the flask to dissolve the glucose
● Add 5 mL of yeast to the solution and loosely plug the top of the flask with
cotton wool.
● Wait while fermentation takes place.
● Remove the cotton wool and pour the invisible gas into the boiling tube
containing lime water. Take care not to pour in any liquid as well.
● Gently swirl the lime water in the boiling tube and note what happens.
● Replace the cotton wool in the top of the flask.
