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Why is there a layer of paraffin atop the yeast solution?
The layer of paraffin / oil will stop oxygen in the air getting into the yeast, creating anaerobic conditions in yeast.
How do you make the test more reliable?
Do more than 3 repeats. This is to identify anomalous results, exclude them from the mean, and calculate other statistics.
Control Variables
Do not change the temperature
Do not change the pH of the yeast
Why should we use a gas syringe?
Use a gas syringe to measure the volume of gas produced in the solution