Investigating How Temperature Affects the Rate of Reaction Between Sodium Thiosulphate and Hydrochloric Acid.

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Meera Pithia 11B

INVESTIGATING HOW TEMPERATURE AFFECTS THE RATE OF REACTION BETWEEN SODIUM THIOSULPHATE AND HYDROCHLORIC ACID

Aim:

The aim of this experiment is to investigate how temperature affects the rate of reaction between sodium thiosulphate and hydrochloric acid.

Theory:

Through the knowledge which I have attained through previous experiments exploring how collisions between particles vary with different temperatures, I have come to the theory that the rate of reaction between sodium thiosulphate and hydrochloric acid will increases with heat.  When temperature is increased, particles move faster and this leads to more successful collisions.  When the number of successful collisions is higher, the rate of reaction is faster.

Fig. 1:                                                              Fig. 2:                      

Figure 1 shows a reaction at a low temperature.  The particles are moving slowly so there are not very much successful collisions.  Figure 2 shows a reaction at a higher temperature.  There are more successful collisions because the particles are moving faster.

The balanced equation for the reaction between sodium thiosulphate and hydrochloric acid is:

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

Temperature has a large effect on the rate of reaction.  The higher the temperature is, the faster the reaction, which also means the faster the solution will turn cloudy.  

Prediction:

I predict that as the temperature is increased, the faster the reaction will take place.  I have come to this prediction using my knowledge of the collision theory which is that as temperature increases, the number of successful collisions increases, which means that the rate of reaction will also increase.

My graphs should present some correlation to the following graphs:

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For a faster reaction there is a shorter time needed for the reaction to finish.  The speed of the reaction is inversely proportional to the time taken for the reaction to finish.

Equipment:

  • Conical flask
  • Bunsen burner
  • Heat proof mat
  • Tripod
  • Heat gauze
  • Measuring cylinder
  • Forceps
  • Thermometer
  • Timer
  • Paper with a ‘X’ on it

Diagram:

Method:

I am going to investigate the rate of reaction between sodium thiosulphate and hydrochloric acid.  The reactants are both ...

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