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Investigating the affect of yeast concentration on the rate of reaction

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Introduction

Investigating the affect of yeast concentration on the rate of reaction Aim: In this experiment I will investigate how the concentration of yeast affects the rate of reaction. Fair test: I will make sure it is a fair test by abiding to the list of measurements, I will use: 25ml of glucose and yeast solution 10% concentration of glucose - Yeast concentration varies Temperature at 37 C Also I will wash every piece apparatus that needs to be re-used thoroughly Apparatus: In my experiment I will need a variety of apparatus, I will need: 6 boiling tubes 1 delivery tube A water bath The specified amounts of glucose and yeast 5 pipettes A small amount of water A measuring cylinder A stop-clock I will set the experiment up as shown: Method: I will set up the apparatus as shown. ...read more.

Middle

At the end I plan to have 50 results in a result table and plot a graph of the average amount of bubbles for each different concentration. Prediction: I predict that the higher the concentration of yeast the more Carbon Dioxide bubbles there will be per minute. The more yeast you have the more active sites there are therefore there should be a lot more collisions giving off Carbon Dioxide bubbles. Also I expect that if you double the yeast concentration, the amount of CO bubbles will double as well. In my graph I predict there will be a strong positive correlation and that it will have a straight and steep line of best fit. ...read more.

Conclusion

Also the size of the bubble varied, some were huge and some were small. I recommended that in the future, for measuring the amount of a gas given off we measured the displacement of water. There were a few anomalies, most were too low and at the start of the investigation. I think that it must take a minute or two for the experiment to get going but I can't explain the ones that were too high or in the middle. Finally I noticed that some other colleagues were cheating and were tapping the delivery tube with stationary to increase the amount of CO bubbles. So, overall I am very pleased with my experiments and my investigation. ...read more.

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