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Find out what concentration best allows the hydrogen peroxide to be digested by the enzymes in the liver solution.

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Introduction

Science Investigation - Basic Rate of Reaction? Sally Emery Aim: The aim of this investigation is to find out what concentration best allows the hydrogen peroxide to be digested by the enzymes in the liver solution. Prediction: The factors that will affect the rate of a reaction are: > The temperature at which the experiment is carried out. > The surface area of the substance being digested. > The concentration of the hydrogen peroxide to water. > Whether or not catalysts are present. I will be investigating the concentration of the hydrogen peroxide to water. I will use the following concentrations: Hydrogen Peroxide (ml) Water (ml) Total (ml) Experiment 1 20 0 20 Experiment 2 16 4 20 Experiment 3 12 8 20 Experiment 4 8 12 20 Experiment 5 4 16 20 Experiment 6 0 20 20 I predict that the higher the concentration of hydrogen peroxide used the quicker the enzymes will work in the liver solution to digest the hydrogen peroxide. Therefore I predict that experiment 1 will work the quickest as there is 100% hydrogen peroxide being used. ...read more.

Middle

When particles move faster, more collisions occur and the collisions are more violent. This should increase the reaction rate. (Information taken from www.learn.co.uk) Apparatus: Method: > We are measuring the change in temperature as the hydrogen peroxide is dissolved by the enzymes in the liver solution. > To keep it a fair test we will keep the room temperature the same throughout the six experiments and we will make sure that the concentrations that are used total 20ml for each experiment. > The variables that will be changed are the concentrations as shown in the table above. > We would have liked to have repeated each experiment three times so as to take an average reading which would give a more accurate reading, however the time limit does not allow us to do this. > We will keep it a safe investigation by wearing goggles at all times. > We will record our results by recording the temperatures on a data logger, then transferring them to a computer so as to use them to produce graphs. ...read more.

Conclusion

Dissolving the reactant in water to make a liver solution as we did increased the surface area and increased the reaction rate. Evaluation: After completing this experiment I feel that my results weren't as accurate as they could have been as we only carried the experiment out once. If time had allowed, I would have liked to have repeated the experiment three times and taken an average reading, rather than relying on one set of results to be accurate. I don't think that I got any odd results as all my graphs increased in temperature as the concentration increased. If I were to carry out this experiment again I would like to use a different reactant in place of the liver to see if the same results occur. I think the results are sufficient to support a firm conclusion, as I don't feel there where any odd results and that the recording of the results was very accurate due to the type of apparatus used to measure the temperature. To extend this experiment I would like to investigate the other factors that affect the rate of reaction. For example the surface area, or the temperature at which the experiment is carried out. ...read more.

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