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# The rate of reaction when dissolving sugar.

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Introduction

An Investigation into The Rate of reaction When Dissolving Sugar Introduction I have been asked to perform an investigation on the length of time it takes for a certain amount of sugar to dissolve in a certain amount of water at different temperatures. I will investigate whether the time taken at one temperature and another will be the same, quicker or slower using scientific methods. Identifying Key Factors The factors that would affect the dissolving rate are: - * Volume of water The larger the volume of water, the quicker the sugar will dissolve because there is more particles for the sugar molecules to collide with. * Mass of sugar The more sugar there is the dissolving rate will be slower as there is more molecules to collide with the water particles. * Size of sugar particles The bigger they are the slower they will dissolve. * Temperature The higher the temperature the quicker the sugar will dissolve The variable I am going to change is temperature. ...read more.

Middle

* Create averages for the results Pre-test results Time Taken for Sugar to Dissolve Temp (�C) 1st attempt 2nd attempt Average 20 50 53 52 40 37 35 36 60 23 25 24 Pre-test Conclusion My pre-test worked very well and the amounts I used of sugar and water I chose worked so well I have decided to use them in my actual experiment. Prediction I predict that in my experiment when the temperature is raised the sugar will dissolve quicker. I believe this will happen because when the temperature is increased the water gains heat energy and the particles gain this energy, which they convert into kinetic energy, causing them to move much faster. This means that there is a higher chance of collision because the sugar and the water particles move towards each other much faster, allowing a head on collision. This collision is when the water breaks down the sugar and dissolves it. Method The apparatus and method are no different to the pre-test only this time I will test for 20�C, 30�C, 40�C, 50�C, 60�C, 70�C, 80�C and I will repeat the readings as before. ...read more.

Conclusion

The particles moved much faster and there was a higher chance of a head on collision so therefore the time taken for the sugar to dissolve decreased when I increased the temperature. Evaluation My experiment went as planned. The temperatures and quantities that I chose to use worked very well in the experiment. Although I took care in keeping all factors the same for a fair test and I repeated the experiment and worked on the averages of my findings. I still found two anomalous results when I plotted my graph. I think this Is because of my rate of stirring could not be kept constant. To improve the experiment I could stir only 10 times instead of stirring constantly throughout the dissolving process. I also think to improve my investigation further I could repeat the readings a third time and therefore I would have a more accurate average. A way to extend my experiment is to test how long the sugar would dissolve if it had a larger mass. I think this experiment was carried out with great care and the instructions were followed to the best of my ability. ...read more.

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