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Chemistry Coursework Introduction For this investigation, I decided to investigate the effect of concentration on the rate of reaction of sodium thiosulphate with an acid. The equation for the reaction is: Na2S2O3 + 2H+ ==> 2Na+ + S + H2SO3 The sulphate precipitate turns the solution milky and this was important for measuring the rate of reaction (see below). Prediction I predict that the greater the concentration of the sodium thiosulphate, the faster the chemical reaction will take place, which means the rate will increase. I think that differing concentrations of a solution affects the rate of the reaction because the rate depends upon how often the reacting molecules collide. If a reactant is more concentrated, there are more molecules in the same volume than in a substance that is less concentrated. As there are more molecules reacting, it means that there are more collisions between the molecules, so the time taken for the substances to react is less. I think that the rate...

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