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An experiment to investigate the effect of changing the concentration of Sodium Thiosulphate in the reaction between Hydrochloric Acid and Sodium Thiosulphate. Introduction The reaction equation for this experiment is: Sodium Thiosulphate + Hydrochloric acid = Sodium chloride + Sulphur dioxide + Sulphur + water Plan Input variable: Concentration of Sodium Thiosulphate. 1) 5ml Sodium Thiosulphate 25ml water 2) 10ml Sodium Thiosulphate 20ml water 3) 15ml Sodium Thiosulphate 15ml water 4) 20ml Sodium Thiosulphate 10ml water 5) 25ml Sodium Thiosulphate 5ml water 6) 30ml Sodium Thiosulphate 0ml water I decided on these variables by doing trial runs on the experiment. Controlled Variables: a) Temperature b) Volume of Sodium Thiosulphate - water solution (always 30ml) c) Concentration of Hydrochloric Acid (always 20ml) d) Stirring (Y/N) Outcome Variable Time for Sodium Thiosulphate - Hydrochloric Acid - water solution to go cloudy. Experiment is considered over when a cross on a piece of paper cannot be seen by looking through the solution from above. Proposed Method a) I will set up the equipment - see below b) I will pour...

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