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The effect of the temperature on a reaction rate

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Introduction

The effect of the temperature on a reaction rate: I) Aim: Observe the effects of temperature on the reaction rate II) List of equipment: - 50 cm3 of sodium thiosulphate solution - 200 cm3 of water - 25 cm3 of hydrochloric acid - flask - cylinder - tripod - micro burner - stop clock - safety goggles - lab coat - a paper with a black cross on it - thermometer III) Method: We put 10cm3 of sodium thiosulphate solution and 40 cm3 of water in a flask at room temperature and then we put 5cm3 of hydrochloric acid and we time the reaction. ...read more.

Middle

Table of results: The rate of reaction => Temperature (�C) / time taken(s) The reaction and the temperature: Start temperature (�C) End temperature (�C) Average temperature (�C) Time of reaction (s) Rate of reaction (/s) 22 21 21.5 130 1/130 26 25 25.5 85 1/85 36 35 35.5 50 1/50 45 42 43.5 44 1/44 55 48 51.5 29 1/29 V) Graph: There is three types of variable in this experiment the independent variable which is the temperature, the dependent variable which is the rate of reaction and the constant variables which are all the substances of this experiment because their remain constant. ...read more.

Conclusion

The temperature change necessary to double the rate of reaction is about 10�C. But it is approximately true; it may be that the rate doubles every 9�C or 11�C. The number of degrees needed to double the rate change gradually as the temperature increases. VI) Conclusion: We have proved that the rise of temperature has an effect the rate of reaction. As you increase the temperature the rate of reaction increases. The rate of reaction doubles for every 10�C rise in temperature. But it is approximately true, the number of degrees needed to double the rate change gradually as the temperature increases. Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions which result in a reaction. ...read more.

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