We are studying the rate of reaction between Hydrochloric acid and Sodium Thiosulphate. We are going to change the concentration of the Hydrochloric acid.

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Science Coursework

Preliminary Experiment

Aim

We are studying the rate of reaction between Hydrochloric acid and Sodium Thiosulphate. We are going to change the concentration of the Hydrochloric acid.

Theory

The Collision theory is when particles store up enough activation energy, they collide and react with each other

Hydrochloric Acid + Sodium Thiosulphate → Sulphur + Sulphur Dioxide    

                                                                   + Sodium Chloride + Water  

2HCl + Na2S2O3 → S + SO2 + 2NaCl + H2O

The factors that could affect the rate of reaction are:

  • Temperature
  • Concentration
  • Catalysts
  • Surface area

Temperature affects the reaction by changing the speed of the reaction depending on the temperature of the Thiosulphate. If it is hot, then the reaction is quicker than if it was cold.

Concentration affects the reaction depending on how concentrated the reaction is. If it is highly concentrated, the reaction is quicker than if it was not highly concentrated.

Catalysts speed up reactions if they are compatible and surface area affects differently in different situations. If it is large it reacts quickly and if smaller it reacts slower.

Prediction

Because of concentration, we can vary the times between the separate experiments. The particles that are in the water dilute those in Sodium Thiosulphate effecting its molar value. If affects the activation energy time.

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Key Variables

We could use temperatures of the acid or the Thiosulphate and use different temperatures, however, this is way too fiddly and will takes ages to get right.

Instead we are going to change the concentration.  We have decided to use the concentration of the acid.

Fair Test

We will change the concentration of the Acid using water to dilute it. We are keeping the total amounts of Thiosulphate and acid the same but we will also keep the same cross for every experiment.

Method

We are going to fill 50cm3 of Sodium ...

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