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# I am going to measure the amount of gas given off when certain amounts of potato react with Hydrogen peroxide.

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Introduction

Biology SC1 Getting the information I am going to measure the amount of gas given off when certain amounts of potato react with Hydrogen peroxide. I will time each reaction until it has given off a certain amount of gas. Apparatus > Water bath > Boiling tube (with tube) > Bung > Measuring cylinder > Ruler > Borer > Scalpel > Pestle and mortar > Beaker > Potato > Hydrogen peroxide > Stop watch Method 1. Set up the equipment like above. 2. Take a cylindrical piece of potato and cut off the skin from both ends of the cylinder. 3. Measure how much you would want to take off and cut with scalpel. 4. Place the potato in the boiling tube. 5. Add the hydrogen peroxide to the potato in the tube, which will also help to push the potato down. 6. Put the bung on the top of the boiling tube ASAP. 7. Take the measurement of how much water is up the measuring tube. 8. Time until the amount of o2 is given off that you want. 9. Record results on a piece of paper. ...read more.

Middle

How to have the potato. 2. Amount of hydrogen peroxide. 3. How long to time for. The first thing I decided was that I should measure the amount of gas given off for 1cm-5cm of potato with a diameter of 1cm. I would first use the borer to get a cylinder of potato then measure the amounts of potato and cut them off. I decided not to mash the potato up, as it would not be possible to work out the surface area exposed to the hydrogen peroxide. I realised I would have to cut the skin off the end otherwise there would be less potato actually in contact with the hydrogen peroxide with the pieces at the end compared to the pieces in the middle. I tried every amount of potato in the boiling tube and 20cm3 hydrogen peroxide was the best measurement as it covered all of the potato. I tried using 25cm3 but the foam that is given off when the potato reacts with the hydrogen peroxide goes up to the tube and starts going down into the measuring cylinder that is why I chose 20cm3. ...read more.

Conclusion

It also goes up quite consistently wit being just over the length of potato each time e.g. for 100mm of potato you get 139 cubic mm of gas given off. Evaluation The experiment has been very good, as it is exactly how I predicted it. There are only a few things that I would change if I did it again. The first thing I would have to overcome would be the fact that when the cut potato is in the air it reacts with the oxygen. This would mean you would have to time from when the borer goes in until the hydrogen peroxide is added to the potato. I would also have to change the method of adding the bung. As soon as the Hydrogen Peroxide gets added to the potato it starts reacting. This means that when you add the bung it will compress some of the air and blow it through into the measuring cylinder. So you would have to time how long till you put the bung in. In conclusion I have found out that the catalyst should in fact make the reaction quicker but not actually make more gas be produced! Oli Jones 1 09/05/07 4 Aleph ...read more.

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