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Andrew Clark Chemistry SC1 Aim: To find out how altering the concentration of Sodium Thiosulphate affects the rate of reaction with Hydrochloric Acid. Background Information: Chemical reactions rely on molecules colliding with each other. For products to be made bonds need to be broken and then bond made. The energy needed to cause these collisions is called the activation energy. If the energy given to the reaction is too low, then it will not proceed - this is the reason why heating often increases rate of reaction (as heating increases the molecules energy). The factors that will affect the experiment, with the reasons for them, are below. All are based on collision theory, which says reactions can only occur when the reactant molecules collide with each other. Concentration. If the concentration of one or both of the reactant solutions is increased, the likelihood of a collision increases. The more molecules of reactant...

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