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Rates of reaction when decolourising acified potassium permanganate.

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Chemistry investigation: Rates of reaction when decolourising acified potassium permanganate. Introduction Over a period of several lessons, we planned an executed an experiment, so as to investigate what variables affect the rate of reaction when decolourising acified potassium permanganate with glucose. It would be easy to tell when the reaction has finished because we would be left with a colourless solution. There are only two feasible variables with which we are conducting the experiment that can be changed. These are the temperature at which the reaction takes place and the concentration of glucose used to react the substances. For the duration of this particular experiment I chose to change the concentration of glucose. Prediction My prediction is that the higher the concentration of glucose present in the experiment the faster the reaction will take place. ...read more.


From the second the last syringe of glucose is added to the solution in the last test tube the timer must be started. The time must be measured for each tube to turn colourless. From this it will become apparent whether the prediction was correct. A table of results must be drawn to finalise this prediction. To keep the experiment fair, the same amount of potassium permanganate should be placed in each tube and the same amount of sulphuric acid as well. The only variable in the experiment is the concentration of glucose-water solution. The experiment should be conducted at room temperature. Results Tube # Result Potassium Permanganate (cm�) Glucose (cm�) Water (cm�) Time (S) 1 Yes 2 1 9 249 2 Yes 2 2 8 223 3 Yes 2 3 7 208 4 Yes 2 4 6 167 5 Yes 2 5 5 140 ...read more.


Also the meniscus effect on the water level must be taken into account. Tension on the surface of the water causes it to magnetically attract to the sides of test tubes and syringes making it difficult to measure the exact water level. Also if the syringe is not viewed at eye level then the actual amount measured can differ by up to 1 cm�. Also it is hard to say exactly when the solution has gone completely colourless. If the experiment could be done again with more accurate equipment then the results could possibly be very different. If there was some way to measure the amount of light that passes through the solution, then it would be easier to tell when the solution had gone completely colourless. There were no anomalous results in this experiment, though that may be due to inadequate equipment. ...read more.

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