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Planning In this experiment I intend to investigate the effects of the concentration of reactants on rate of reaction. Specifically I will investigate what effect varying the concentration of hydrochloric acid has when it is reacted with sodium thiosulphate. The details of how a reaction works on a molecular level are described by the collision theory. [image001.gif] The collision theory explains the circumstances under which collisions between the particles of the reactants involved in a reaction must collide, in order for a reaction to occur. In order to react, the individual particles of a reactant must not only collide in the correct orientation (as explained in the diagram below), but must also collide with sufficient energy. When both of these are achieved, the collision is strong enough to break any existing bonds and form new ones. The minimum amount of energy required in a collision for two particles to react is called the activation energy, and varies according to...

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