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For our investigation we will be looking at how the temperature affects the rate of reaction between sodium thiosulphate and an acid. To make sure the experiment is a fair test we must first see which other factors may effect the investigation and how we can control them. The temperature, concentration of the two solutions, the light intensity, the depth of the solution and the person judging whether they can still see the cross are all factors which may affect the rate of the reaction. Description of reaction: When sodium thiusulphate are added together they react as shown below: HCL + sodium thiosulphate sodium chloride + sulphur dioxide + sulphur + water. HCL(aq) + Na2S2O3(aq) NaCl(aq) + SO2(g) + S(s) + H2O(l) The sulphur produced is held in suspension turning what was a colourless solution into a clouded one. This is what causes the cross to disappear. When we are measuring the time for the...

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