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In this investigation I plan to explore the effects of concentration on the role of reaction between hydrochloric acid and sodium thiosulphate. When these two reactants are chemically reacted together sodium chloride, sulphur dioxide and sulphur are produced. Sodium thiosulphate + hydrochloric acid -->sodium chloride + sulphur dioxide + sulphur + water. This is the word equation for this reaction the symbol equation is: Na2 S2 O3 (aq) + 2HCl (aq) --> 2 NaCl (aq) + H2 O (l) + SO2 (g) +S (s) Produced during this reaction is a solid precipitate of sulphur causing the mixture to become increasingly cloudy. A precipitate is a substance, which is insoluble and is an emulsion. In order to calculate the length of the reaction, we can use the formation of the precipitate which prevents us from seeing the cross and when this happens the reaction has finished. To work out the rate of reaction we use the inverse of...

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