How the Concentration of Sodium Thiosulphate affects the Rate of Reaction

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Bonnie Kingett 10tdC1        Page         22/02/2010

Rate of Reaction Coursework

By Bonnie Kingett

Contents

Aim....................................................................................................................2

Introduction.......................................................................................................2

Preliminary Plan................................................................................................2

Preliminary Results...........................................................................................3

Safety................................................................................................................4

Fair Test............................................................................................................4

Method..............................................................................................................5

Results..............................................................................................................5

Conclusion........................................................................................................7

Evaluation.........................................................................................................8

Aim:

The aim of our investigation was to find out how the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid is affected by varying the concentration.

Introduction:

The rate of reaction is the rate of loss of a reactant or the rate of development of a product during a chemical reaction. It is measured by dividing 1,000 by the time taken for the reaction to take place. There are five factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface area (of solids), and catalysts. We have chosen to investigate the effect of concentration on the rate of reaction. This is because it is the most practical to investigate.

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Dealing with temperatures is a difficult task, especially when we have to keep constant high temperatures. Secondly the rate equation and the constant k changes when the temperature of the reaction changes. We have no gases and solids involved therefore it is easy to deal with solutions. Similarly the use of a catalyst complicates things, and if used incorrectly could alter the outcome of the experiment. The theory behind this experiment is that 'Increasing the concentration can increase the rate of the reaction by increasing the rate of molecular collisions.' This means that since there are more reactive atoms ...

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This report has a very good introduction and a detailed, if poorly laid out method. However, there is no conclusion and the evaluation is very poor Overall, this piece of work is 2 stars out of 5