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The iodine clock mechanism

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Introduction

The iodine clock mechanism I am going to investigate the effects of changing temperature and concentration has on the iodine clock reaction. Chemical reactions occur when particles collide. They must collide with a certain minimum energy called the activation energy. Diagrams Concentration of low particles. There aren't many collisions as the concentration is so low there is not much energy. Concentration higher more chance of particles colliding. There is more energy so there is more chance of collision. By kirsty skidmore Temperature low Not much chance of collision. As there is a low temperature there is not enough energy to make the particles collide. ...read more.

Middle

In my experiment the consternates will be the amounts of starch, potassium iodide and potassium aeroxidisulphate the things that where variables will be is water and potassium sulphate. In are experiments we are using test tubes, all together we are using 10ml of solution. The starch will be 1ml, potassium iodide will be 3ml and potassium aeroxidisulphate will be 2ml. Instead of stirring are solution we are going to shake it. The temperature of the first experiment will be 17c. By kirsty skidmore The first experiment will consist of KI 3ml, H2O 2ml, NA2S2O4 2ml, starch 1ml and K2S2O8 2ml. The second experiment will consist of KI 3ml, H2O 1ml, NA2S2O4 3ml, starch 1ml and K2S2O8. ...read more.

Conclusion

Test 1 Test 2 Test 3 10 1 2.35 mins 3.16 mins 2.53 mins 20 2 1.20 mins 1.14 mins 1.18 mins 30 3 41 secs 40 secs 41 secs 40 4 23 secs 19 secs 19 secs 50 5 12 secs 7 secs 14 secs Conclusion My prediction was wrong but I can now see why it was wrong temperature plays a big part in chemical reactions as you can see from above as it gives them more energy. If I was to do this experiment again I would insulate the test tube so no heat could get in or escape from the beaker. I would also use a mechanical shaking devise so I know that they are all getting the same constant rate of shaking. By kirsty skidmore ...read more.

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