Hydrochloric Acid with Sodium Thiosulphate Investigation

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Write-up of the Experiment

Introduction

A reaction can be made to go faster or slower by changing the concentration of a reactant. If a solution is made more concentrated it means there are more particles of reactant knocking about between the water molecules which make collisions between the important particles more likely.

Aim

The aim of this experiment is to find out how fast the reaction will be between Sodium Thiosulphate solution and Hydrochloric Acid when different concentrations of the acid are added. This will determine the effect of concentration on the speed of a reaction.

Method

  • 50cm³ of Sodium Thiosulphate was poured into four conical flasks.
  • In the first conical flask, 0.25M of 50cm³ of Dilute Hydrochloric Acid was poured.
  • In the second, 0.5M was poured, in the third 1M was poured and in the fourth 2M was poured.
  • All four of these tests were repeated.
  • Every experiment was placed on a piece of paper that had a cross drawn on it.
  • The cross is timed till it disappears where it cannot be seen through the solution in the conical flask.
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Results

The results for the first round of experiments:

The results for the second round of experiments:

Average Results:

Discussion of Results

The experiments were a success because the results of the first group of experiments were very similar to that of the second group of experiments. From the results we can notice that the line in the graph curves down, meaning that the time is decreasing as the concentration of acid increases. This shows that the more concentrated the ...

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