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TO INVESTIGATE THE RATE OF THE REACTION BETWEEN DILUTE HYDROCHLORIC ACID & SODIUM THIOSULPHATE A. Introduction In order to investigate the rate of reaction between a dilute solution of hydrochloric acid and a solution of sodium thiosulphate, the variables that can affect the rate of reaction between any two reactants must, firstly, be identified. These variables are discussed below using the particle theory of matter, which is; that all matter is composed of particles and their behaviour can be predicted. The particles in this chemical reaction are the atoms and molecules of the reactants and the products of the reaction. Under normal conditions the particles are vibrating about a mean position, the level of energy processed by the particles can be increased by making them vibrate more. Collision theory says that reactions will proceed faster when the collisions are more frequent and with sufficient energy. The following variables affect rates of reaction. 1....

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