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In this investigation, I try to find out whether temperature is able to affect the rate of diffusion, and I will be using potassium manganate (VII) crystals for my experiments.

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Introduction

Diffusion is when the particles are moving randomly by colliding into each other, from an area of high concentration to an area of low concentration. Aim In this investigation, I try to find out whether temperature is able to affect the rate of diffusion, and I will be using potassium manganate (VII) crystals for my experiments. Prediction I predict that temperature does affect the rate of diffusion. At first, when the potassium manganate (VII) is added in the water, the water will collide with the permanganate iron in the crystals. Then particles of the water and crystal move in a constant random motion and randomly distribute to allocate in different places. When the temperature of the water with potassium manganate crystals in increases, the particles in the water and crystal will then speed up and move around more quickly. Therefore it will take less time for the purple colour to spread out. As the heat energy is added to the particles of the water and crystal, the particles of the water will convert the heat energy into kinetic energy, which makes these particles move faster and the diffusion will speed up as well. ...read more.

Middle

crystals in the water and start the timer * Observe the diffusion takes place while the purple colour of the crystals diffused in the water * When the water turn all purple stop the timer and record the result * Do a few more experiment at different temperatures of water to find out how the temperature of the water affects the diffusion rate Trial The trial is to check will the experiment work. So time won't be wasted during the experiment. During the trial, I used the highest and lowest temperature of water that I may use for this experiment. Temperature of water (�C) Time for purple colour to spread (seconds) 91 47 33 (temperature is too low, takes too long to spread) 42 (better than the last one, but temperature is still too low) Modification In the trial the glass rod was used to place the potassium manganate crystal in the same place. However the crystal stuck to the glass rod instead, so the glass rod will not be used when doing the experiment. I have used 91, 42 and 33 degrees as the temperature of the water. ...read more.

Conclusion

Therefore the purple colour also spreads faster as the temperature of the water gets higher. Evaluation The results obtained from the experiment turned out quite good, except from one anomalous result. That is the one at of 53 �C and takes 165 seconds for the purple colour to spread. The result is slightly out of the best fit line on the graph. Either the amount of water or the amount of potassium manganate used caused this error. Due to the limit of time, I didn't have a chance to re-do the experiment. If I can do this experiment again, I would measure the amount of water and potassium manganate more carefully. I would also have to repeat each experiment two to three times to enhance accuracy. A thermostat can also be use to get a more accurate and exact temperature of the water For further investigations, another solid substance can be used, such as iodine. We can use other substances and see whether temperature also affect the rate of diffusion of these substance. But we have to always remember to repeat the experiment at least 3 times, no matter what substances we will use. ...read more.

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