Investigating the effect of concentration on the rate of reaction between Sodium thiosulphate and hydrochloric acid.
Introduction.
I am measuring the rate of reaction (how fast a reaction takes) of sodium thiosulphate and hydrochloric acid. There are different variables I could use to see the change in the rate of reaction. These include temperature, concentration or catalysts. I am going to do two experiments, one changing the temperature and one changing the concentration of the sodium thiosulphate. This experiment is about the effect of concentration on the rate of reaction.
Hypothesis.
I presume that when the concentration of the Sodium thiosulphate is increased, the rate of reaction will be higher. This is because if there are more molecules, they are more likely to collide and react. However, the collision theory says that a very small percentage of these collisions results in a reaction. This is because of an energy barrier. Only those particles with enough energy to overcome the energy barrier will react when they collide. So, if the frequency of collisions is increased, the rate of reaction will increased. However, the percentage of successful collision will remain the same. The particles go through random collisions in which energy is transferred between the colliding particles and this leads to particles with differing energies. However, it remains to be seen if the results will follow this theory. However, it remains to be seen if the results will follow this theory.
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Plan.
As the diagrams show. firstly, I will measure the right amount of sodium thiosulphate and hydrochloric acid into two separate test tubes (First, 50cm cubed of Sodium thiosulphate and 10cm cubed of water). The experiment will be done at room temperature (My second experiment will be about the effect of temperature on the reaction of Sodium Thiosulphate). The beaker will be filled with Na S O and water via two measuring cylinders and placed on the A4 paper marked with a cross.
