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Kinetics Practical

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Introduction

Kinetics Practical Omar Alayoub Block 4 April 2nd, 2009 IB HL Chemistry Year 1 Ben Graham Research Question: To determine the effect of temperature on reaction rate of KMnO4+ H2SO4+ Fe Hypothesis: After boiling the solution using the hot plate, the rate will go faster. However, when we cool it with ice, the reaction rate will go slower. Apparatus: Equipment: Uncertainty: 25 cm3 Graduated Cylinder �0.25 cm3 Ice Bucket as an insulator - Hot plate - 8 Ice Cubes - ** 60 cm3 of 1.0 mol dm3 Sulphuric Acid - ** 60 cm3 of 0.02 mol dm3Potassium permanganate - Iron (Steel) Wool - Thermometer � 0.5�C Stopwatch � 0.05 seconds ** Use 20cm3 of each solution per trial. Variables: Controlled * 25 cm3 Graduated Cylinder * Ice Bucket as an insulator * Hot Plate * 8 Ice Cubes * Sulphuric Acid (Constant amount and Concentration) * Potassium Permanganate (Constant amount and Concentration) * Surface are of Steel Wool (Constant diameter) * Thermometer in �C Independent: Change of temperature �C Dependent: Time in seconds of chemical reaction. ...read more.

Middle

16. Record the temperature in �C. 17. Remove the solution from the ice bucket and add the iron wool to the potassium permanganate and immediately start timing. 18. Using the stopwatch, measure the time taken to note a "significant "change. 19. Repeat the steps twice for two additional trials. **Note: Stop timing when you see the dark pale colour change to a neutral transparent colour. Data Collection: Time taken after Temperature Change: Temperature/�C: � 0.5�C Time (s): � 0.05 s Trail #1 Time (s): � 0.05 s Trail #2 Time (s): � 0.05 s Trail #3 Average time: T1+T2+T3 3 Room temperature: 22 51.62 49.41 53.26 51.43 Hot Plate: 67 36.57 29.87 32.94 33.13 Ice Bucket: 14 62.59 65.15 69.02 65.59 ** Temperatures were kept constant. Data Processing: ** Used the Average of all the times. Overview: I chose to present my data as a scatter line graph in order for the reader to see the changes between different temperatures and also to see the difference between trails with the same temperature. ...read more.

Conclusion

o Varying in temperature will help me make my conclusion more specific. Sources of Error: Type of Error: Error: Effect on result: Ways of Improving. Systematic Stirring rate. Stirring the solution with random speeds for every trial will result in random results. The student has to focus on the speed he is stirring at throughout the whole experiment. Systematic Size of the steel wool. The size of steel wool could also affect the amount of time it takes to make a significant change. And therefore, there are two factors instead of one. To improve this error, the student has to mass every steel wool he uses. Systematic Loss of heat. After removing the solution from the hot plate, some of the heat is lost therefore the temperature may not have been accurate. To improve this error, I think that the student should do the experiment on top of the hot plate however stop the heating process. Random Uncertainties errors. This could cause the experiment to be a little less accurate depending on the material you use. There is now way of improving the experiment however, to decrease the inaccuracy we have to use materials with small uncertainties. ...read more.

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