Experiment 1.3 To Study the effect of Temperature on the Rate of Reaction

Aim :
To investigate the effect of temperature on the rate of reaction between sodium thiosulphate solution and dilute sulphuric acid



Procedure :
1. 50 cm3 if 0.1 mol dm-3 sodium thiosulphate solution is poured into a dry, dry conical flask.
2. The temperature of the sodium thiosulphate solution is measured with a thermometer.
3. The conical flask is placed on a white paper marked with a cross “X”.



4. 5 cm3 of 1 mol dm-3 sulphuric acid is quickly poured into the sodium thiosulphate solution.
5. The stopwatch is started immediately and the conical flask is swirled gently.

6. The cross “X” is viewed from above. The stopwatch is stopped as soon as the cross disappears from view and the time taken is recorded.

7. The solution in the conical flask is poured out. The conical flask is washed thoroughly and dried. 50 cm3 of 0.1 mol dm-3 sodium thiosulphate solution is poured into the conical flask.
8. The solution is heated over a wire gauze until the temperature reaches about 45˚C.

9. The hot conical flask is placed over a white paper marked with a cross “X”.
10. 5 cm3 of 1 mol dm-3 sulphuric acid is measured out using a 10 cm3 measuring cylinder.
11. When the temperature of sodium thiosulphate solution falls to 40˚C, the sulphuric acid is quickly poured into the thiosulphate solution.
12. The stopwatch is started immediately and the conical flask is swirled gently.

13. The cross “X” is viewed from the top and the time taken for the cross to disappear from the view is recorded.
14. Steps 7 to 13 are repeated at a higher temperature of 50˚C, 55˚C and 60˚C respectively.

Special thanks to ace_0106 for typing the procedures.