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GCSE Chemistry - Sodium Thiosulphate coursework Preliminary Study I am going to investigate the rates of reaction, and the effect different changes and factors have on them. The rate of reaction id the rate I lose a reactant or the rate of formation of a product during a chemical reaction. The rate of reaction is measured by dividing 1 by the time taken for the reaction to take place. There are five factors that affect the rate of reaction; these are - temperature, concentration (of solution), pressure (in gases), surface area (of solid reactants) and catalysts. I have chosen to investigate the effect concentration has on a reaction, the reason being because this is practical to measure. Aim To see the effects of changing the concentration of Sodium Thiosulphate has on the rate of reaction. Here is the word and symbol equation (balanced) of my investigation: Sodium Thiosulphate + Hydrochloric acid --> Na2S2O3(aq)...

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