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Investigating how the amount of Hydrogen Peroxide will affect the speed in which the Oxygen is separated from the water in Hydrogen Peroxide and the total oxygen collected.

Extracts from this document...

Introduction

Science Investigation Catalysts I am investigating how the amount of Hydrogen Peroxide will affect the speed in which the Oxygen is separated from the water in Hydrogen Peroxide and the total oxygen collected. Planning: Task: My task is to investigate what effects the action of Catalase, from Potato, have when adding hydrogen peroxide (H202) and having one variable each time. Planning: I have chosen my variable to be the amount of hydrogen peroxide (H202). I am also doing 5 different amounts of hydrogen peroxide (H202) increasing by 5cm3 each time so that I have a wide range of results. I am going to repeat each different temperature 3 times so that my results are more reliable. I am then going to work out an average for the result of each different hydrogen peroxide (H202). I am going to use a gas collecting tube to collect the amount of gas given of by the hydrogen peroxide (H2O2) when the Catalase is put into it. You then time it until the oxygen has stopped being given off (bubbles stop). Equipment: Safety Spectacles 15 conical flasks labelled 1A, 1B, 1C, 2A, 2B, 2C, 3A, 3B, 3C, 4A, 4B, 4C, 5A, 5B and 5C. Ice cream tub 1/2 full of water Gas Collecting Tube Tube and bung 2 Clamps Stand Hydrogen Peroxide (H2O2) Burette Thermometer Cork borer Stop Clock Method: 1. ...read more.

Middle

were similar although they weren't very high this means that the results weren't very accurate this is because they were old Potatoes. The second 25ml result was a better potato than the first 25ml's potato. If I keep the same potato the results will more similar and if I make it a newer potato the results will be more accurate. I realised that for each repeat I had to use the same potato otherwise the results were better or worse depending on how new or old the potato was. If the potato was newer than the results were better and if the potato was older the results were worse. I think this is to do with how quickly the catalyst is working. Once I've made sure the potato is the same I'm going to wait only 3 results the same until I stop the stop clock unless I can see any bubbles. This will save my time and will still be accurate. Obtaining: I collected my 5 ml results using the same potato Results - 5ml: Time 5 5 5 Average 0.15 1.4 1.0 1.2 0.30 2.6 2.1 1.9 0.45 3.4 2.7 2.4 1.00 4.0 3.9 2.9 1.15 4.6 4.4 3.6 1.30 5.1 4.9 3.8 1.45 5.7 5.4 4.1 2.00 5.9 5.7 4.6 2.15 6.6 6.2 4.8 2.30 7.0 6.8 5.0 2.45 7.3 7.2 5.2 3.00 8.0 7.4 5.3 3.15 8.0 7.9 5.6 3.30 8.7 8.0 5.9 3.45 8.7 8.2 6.0 4.00 8.7 8.4 6.3 4.15 8.7 8.6 ...read more.

Conclusion

9.60 6.30 9.6 9.6 9.7 9.63 6.45 9.6 9.6 9.7 9.63 7.00 9.7 9.6 9.9 9.73 7.15 9.9 10.2 9.9 10.00 7.30 10.1 10.2 10.1 10.13 7.45 10.4 11.3 10.3 10.67 8.00 10.5 11.3 10.4 10.73 8.15 10.6 11.3 10.7 10.87 8.30 10.8 11.3 10.7 10.93 8.45 10.8 11.3 10.7 10.93 9.00 10.8 11.3 10.9 11.00 9.15 10.9 11.3 11.1 11.10 9.30 11.0 11.3 11.2 11.17 9.45 11.2 11.3 11.3 11.27 10.00 11.2 11.3 11.3 11.27 10.15 11.7 11.3 11.5 11.50 10.30 11.7 12.3 11.9 11.97 10.45 12.4 12.3 11.9 12.20 11.00 12.4 12.8 12.1 12.43 11.15 12.4 12.8 12.3 12.50 11.30 12.6 12.8 12.3 12.57 11.45 12.6 12.8 12.5 12.63 12.00 12.8 12.8 12.6 12.73 12.15 12.8 12.8 12.9 12.83 12.30 12.9 12.8 13.1 12.93 12.45 13.0 12.8 13.3 13.03 13.00 13.1 12.8 13.3 13.07 13.15 13.2 13.3 13.4 13.30 13.30 13.6 14.1 13.4 13.70 13.45 13.8 14.2 13.4 13.80 14.00 13.8 14.7 9.50 14.15 14.6 15.0 9.87 14.30 14.7 15.0 9.90 14.45 14.7 15.0 9.90 15.00 14.7 4.90 Average of final results: 14.90 When there was 3 or more I could see the bubbles still left so I left it as I said I would, as I knew that it couldn't have finished. Analysis: Evaluation: I found out that I needed to use the same potatoes for the repeats cutting it fresh for each experiment and the same freshness of potato (same distance from use-by date) and type of potato for them all. Linda King 9J2C/Red ...read more.

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