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# Lab report: the effect of temperature on the rate of reaction

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Introduction

The effect of the temperature on the rate of the reaction Aim: to develop a method for studying how an increase in temperature affects the rate of a reaction Materials: digital thermometer, boiling tubes, test tubes, 3 burettes, potassium iodide solution, sodium thiosulphate solution, freshly made starch solution, stopwatch, heater Independent variable: the temperature of the water in the beakers Dependent variable: time of the reaction Controlled variables: the volumes of sodium thiosulphate, potassium peroxodisulphate, starch solution, potassium iodide, the mass of the beaker, the mass of the test tube Procedure 1. ...read more.

Middle

into different burettes. 2. Add 3cm3 of 0.2mol dm-3 of potassium iodide solution(KI), 4cm3 of 0.1mol-3 potassium peroxodisulphate(K2S2O3) solution, 2cm3 of 0.01mol-3 sodium thiosulphate (Na2S2O3) into a test tube. 3. Add 150cm3 of water into a 250cm3 beaker. 4. Heat the water until it reaches 20�C. 5. Put the test tube into the water in the beaker. 6. ...read more.

Conclusion

Time taken (min) 20 21.60 22.17 30 12.60 12.45 40 8.57 8.42 50 5.50 6.32 60 3.02 2.07 70 2.07 2.90 Measuring the rates of the reactions To measure the rates of the reactions in these experiments, this equation is used: Rate of reaction= temperature change/ time taken Temperature (�C) experiment 1 experiment2 20 0.926 0.902 30 2.381 2.410 40 4.667 4.751 50 9.091 7.911 60 19.868 28.986 70 33.816 24.138 Conclusion As the temperature increases, the rate of the change of the color of the solution increases. This shows that the rate of the reaction increases. ...read more.

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