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Sodium Thiosulphate 'Investigation' Aim In this experiment I will be investigating the different factors which will affect the rate of reaction between sodium thiosulphate and hydrochloric acid. Those factors are: 1) Temperature 2) Concentration of Acid 3) Catalysts I have chosen to do the experiment using different concentrations of acid, to discover how this can affect the length of time it takes for a reaction to occur. I will increase the concentration of hydrochloric acid each time, and see if the rate of reaction increases. I will time how long it takes for an 'X' placed under a conical flask of the solution to disappear using a stopwatch. Prediction I predict that the higher the concentration of hydrochloric acid the quicker the 'X' will disappear, e.g. 2.5 rather than 0.5. I think this because of the collision theory. In a weaker concentration of hydrochloric acid, such as 0.5, it is diluted so it consists of more water...

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