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# Investigating the effect of concentration on the reaction of propanone and iodine.

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Introduction

Investigating the effect of concentration on the reaction of propanone and iodine. Formula The equation for the reaction is: - CH3CO.CH3 CH3.CO.CH2I + HI Prediction I predict that increasing the concentration of the propanone increases the rate at which reaction with iodine (I2) takes place, because the density of particles in more concentrated solutions is greater, the chances of collision between propanone particles and iodine particles increases, the chance of reaction also increases. Furthermore if the concentration doubles I predict that the rate of reaction will double because the density of the particles doubles, doubling the chance of collision. Predicted graph Fair test To ensure the experiment is a fair test I must control the variables these are: - > The volumes of each solution, these will be carefully measured from burettes, this will ensure accurate measuring > The amount of I2 will be kept constant, a white tile will be used and when the tile is as white as possible the timer will be stopped, this should allow for accurate timings > 2 ...read more.

Middle

Water ( to vary the concentration of the propanone Concentration of Propanone ( M/Dm?�) Iodine (cm�) Hydrochloric acid ( the catalyst) 20 0 2 2 15 16 4 1.6 2 15 12 8 1.2 2 15 8 12 0.8 2 15 4 16 0.4 2 15 Plan The reaction of propanone and iodine with the catalyst HCl. The experiment was set up with the chemicals as shown above. When the iodine is added the timer starts, when the tile is perfectly white the timer is stopped. The concentrations are shown above but they are explained below in greater detail. Adding water varies the concentration of the propanone; this reduces the concentration but water itself has no effect on the reaction. A white tile will be used to measure the amount of iodine reacted. Results (Initial rate = 1/time) Concentration of Propanone ( M/Dm?�) Time 1 seconds Initial rate for exp. 1 Time 2 seconds Initial rate for exp. ...read more.

Conclusion

This would allow greatly improved results. Anomalies 1 anomaly was found, throughout the 3 trials it was the point furthest away from the predicted and best-fit line, the average shows this to- furthest from both lines. This was probably due to a human error in judging the colour of the solution, timing the reaction slightly out or a fault in measuring the products. Either of these will have had an effect on the results. Improvements The experiment could be greatly improved by the use of a colorimeter. As stated above, the light transmitted into the photocell is carefully measured and will achieve more accurate results than the human eye. A narrow beam of light passes through the solution under test towards a sensitive photocell. The current generated in the photocell is, dependant on the amount of light transmitted by the solution which in turn depends upon the concentration of coloured solution under test. This means that the margin of error is much smaller because the human eye will always be slightly varied. C.Johnson Page 1 Chemistry coursework ...read more.

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