Sodium Thosulphate

Chemistry Coursework
Rate of reaction

Plan an investigation into the rate of reaction between Sodium thiosulphate and hydrochloric acid.

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Background information:

• The equation for the rate of reaction is 1/time.
• The rate of reaction measures the speed of reaction. It is a measure of the loss of reactants and gain of products.
• The faster a reaction takes place, the shorter the time needed for the reaction to finish.
• An example of a slow reaction is rusting
• An example of a fast reaction is sodium and water.

Collision Theory:

This predicts what will happen to the speed of a reaction if a variable like surface area, concentration and temperature. This theory says that when particles collide a reaction occurs.

Surface area:
• With a greater surface area a solid, particles collide far more frequently and as a result the reaction rate is greater.

• If there is a higher concentration the particles are closer and they have a greater chance of colliding. The more collisions, the faster the reaction.

• The higher the temperature the faster the particles are going to move. This means that there are many energetic collisions that will speed up the reaction.

The word and chemical equation, for this reaction, which takes place in a solution:



The variables you can change in this experiment are:
• temperature
• concentration of acid

The variables that we will be keeping constant are:
• the volume of acid

Equipment List:

• funnel
• conical flask
• measuring cylinder
• tile with black cross
• stopwatch
• sodium thiosulphate
• hydrochloric acid
• water



I predict that the rate of reaction would get faster, if the volume of sodium thiosulphate was increased. This is because a higher concentr…

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