To investigate the reaction between Sodium Thiosulphate and Hydrochloric Acid.

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Reaction Rates

Aim: To investigate the reaction between Sodium Thiosulphate and Hydrochloric Acid.

Prediction: I think that as the amount of Sodium Thiosulphate is decreased and the volume of water increased, the reaction time between it and Hydrochloric acid will increase. This is because when the concentration of a substance is increased, it reacts a lot quicker due to there being more particles that want to react with each other. Reactions can only happen when the reactant particles collide, but most collisions are not successful in forming product molecules. Water has been introduced in this experiment to vary the concentration. If there is more water in the experiment, the less concentrated the Sodium Thiosulphate will be, therefore slowing the reaction.

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When Sodium Thiosulphate reacts with an acid, a yellow precipitate of sulphur is formed.

Diagram:

As you can see, the higher the concentration, the more collisions between particles will happen

Variables: During the experiment I will keep the amount of Hydrochloric Acid the same and the total volume will always add up to 60cm3 to make it a fair test. I will change the amount of Sodium Thiosulphate from 50cm3 and decrease