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Sodium thiosulphate reacts with hydrochloric acid to produce a yellow precipitate of sulphur.
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| Submitted: Sun Dec 15 2002
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Sodium thiosulphate reacts with hydrochloric acid to produce a yellow precipitate of sulphur. We can follow the rate of a chemical reaction by timing how long it takes for the sulphur to obliterate a cross drawn on a piece of paper. Aim To see how the concentration of sodium thiosulphate changes the rate of reaction. Prediction I predict the more concentrated the sodium thiosulphate is the faster the cross will disappear therefor the faster the rate of reaction will be. I think this will happen because the higher the concentration the more sodium thiosulphate particles there will be to collide successful with the acid, to cause a greater chance of a successful collision. Apparatus Conical flask, hydrochloric acid (5cm3), paper with cross on, stopwatch, sodium thiosulphate, water, 2 measuring cylinders (10 & 50 cm3), thermometer. Trial Run Aim: to find the minimum and maximum concertration. Set up apparatus as shown....
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