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Investigation How does the concentration affect the rate of a reaction Aim To investigate the effect of concentration on the rate of a chemical reaction between sodium thiosulphate solution and hydrochloric acid Reaction I will investigate the reaction between different concentrations of sodium thiosulphate solution with hydrochloric acid Na2S2O3aq HCLaq Ss H2Ol SO2g NaCls sodium thiosulphate hydrochloric acid sulphur water sulphur dioxide sodium chloride Background Information There are three ways of measuring the rate of reaction 1By observing the time taken for a precipitate to obscure a mark on a piece of papercard 2Change in mass usually caused by a gas being given off 3The volume of gas given off by using a syringe There are four factors that affect the rates of reaction 1Temperature 2Concentration pressure in the case of a gas 3Size of particles surface area 4Presence of a catalyst The collision theory is a way of explaining the above factors which effect the rate of reaction The four factors can be explained in terms of increasing the number of collisions and in terms of temperature increases the rate at which collisions occur Temperature When temperature is increased the particles move more quickly hence increasing the number of collisions The temperature increase makes the particles move faster by giving them more energy It is this way that collisions can happen at a faster rate 61558The temperature will be controlled in this experiment This is because we are only testing the effects of changing the concentration and if the temperature varies too we will not get an accurate result We will make sure the temperature is the same all the way through Concentration pressure If the solution is made more concentrated it means the number
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