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Investigate the effect of concentration upon the rate of reaction between Sodium thiosulphate (Na²S²O³) and dilute Hydrochloric acid (HCl).  

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Chemistry AT1 28/12/2003 Aim: To investigate the effect of concentration upon the rate of reaction between Sodium thiosulphate (Na²S²O³) and dilute Hydrochloric acid (HCl). This is: Na²S²O³ + HCl 2NaCl + H²O + SO² + S This experiment will be done in two parts. Firstly the experiment will be done with the volume of HCl and total volume constant, and changing the Thiosulphate and water volumes, thereby changing the concentration of the thiosulphate. The second part of the experiment will be keeping the thiosulphate and total volume constant and changing the HCl and water volumes. The indicator for the rate of reaction is the sulphur deposit left by the reaction, and when it covers a cross on a piece of paper, the timing is stopped. Theory: I believe that the weaker the concentration of the thiosulphate, the slower the rate of reaction. This is because of collision theory. In collision theory there...

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