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Chemistry Coursework How Concentration Affects a Reaction Aim: The aim of this experiment is to find out how concentration affects the rate of reaction between Hydrochloric Acid and Sodium Thiosulphate. Introduction: This experiment will be carried out by drawing a cross on a piece of paper and mixing hydrochloric acid and sodium thiosulphate together to see if the cross disappears. The concentration of hydrochloric acid would change every reaction to show that concentration effects a reaction. The time in which the cross took to disappear would be recorded as well as the temperature at the start and end of the reaction, the concentration of the hydrochloric acid and the amount of hydrochloric acid and sodium thiosulphate used. Preliminary Work: The problems that arose whilst doing the preliminary experiment was that the beakers and measuring cylinders were not cleaned out properly and some of the sodium thiosulphate turned cloudy were there was previously hydrochloric acid inside the...

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