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Disappearing X Experiment. Coursework About Sodium Thiosulphate And Hydrochloric Acid. Method, Results, Fair Testing, Evaluation Included. Was Marked With A Passing Grade.

686 words - 3 pages

Disappearing X ExperimentIntroductionI am going to investigate the rate of reaction between sodium thiosulphate (thio) and hydrochloric acid.Hydrochloric Acid + Sodium Thiosulphate "" sodium chloride + water + sulphurThe reactants are both colourless, but one of the products, sulphur, is yellow, so we can use this fact to follow the rates of reaction. I am going to investigate how the concentration of the acid effects the speed of the reaction.Apparatus1 small measuring cylinder1 large measuring cylinder1 small beaker1 large beakerHydrochloric AcidSodium ThiosulphateCross drawn on paperConical flaskWaterStopclockMethodFirst of all we measured out 25cm3 acid and 25cm3 sodium thiosulphate. Then we drew a cross onto a piece of paper and put an empty conical flask on top of the paper. Next, we poured the 25cm3 acid and 25cm3 thio into the conical flask and started the stop clock. We timed how long it took for the solution to turn cloudy so that the cross could no longer be seen. We then decided to change the experiment to see if the concentration of the acid affected the rate of reaction. To do this we added water to the acid and did the experiment again 4 times, decreasing the concentration of the acid by 5cm3 each time. We did this by measuring out the acid in a beaker and pouring it into a measuring cylinder along with the water as well. We then added the contents of the cylinder to the conical flask along with the 25cm3 sodium thiosulphate.VariablesI changed the concentration of the hydrochloric acid by adding water to it.25 Acid / 0 Water / 25 thio20 Acid / 5 Water / 25 thio15 Acid / 10 Water / 25 thio10 Acid / 15 Water / 25 thio5 Acid / 20 Water / 25 thioInstead of changing the concentration of the acid, we could have added water to the thio, like this:25 Acid / 25 thio / 0 Water25 Acid / 20 thio / 5 Water25 Acid / 15 thio / 10 Water25 Acid / 10 thio / 15 Water25 Acid / 5 thio / 20 WaterWe could also have changed the temperature of the thio before mixing it with the hydrochloric acid, or the temperature of the...

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