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Reaction between sodium thiosulphate solution (Na2S2O3) and dilute hydrochloric acid (HCl)
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| Submitted: Sun Dec 15 2002
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The reaction between sodium thiosulphate solution (Na2S2O3) and dilute hydrochloric acid (HCl) can be used to investigate the affect of concentration upon reaction rate. The equation for this reaction is: Na2S2O3 + 2HCl 2NaCl + H20 + SO2 + S The concentration of Na2S2O3 is 0.16 mol/cm3 and the HCl is 2 mol/cm3. You must use 50cm3 of sodium thiosulphate solution each time and 5cm3 of hydrochloric acid. The reaction is carried out in a flask placed on a piece of white paper, which has a cross upon it. During the reaction a yellow precipitate of sulphur is formed. At the beginning of the reaction the cross can be seen easily. As the flask becomes more and more cloudy the cross gets harder to see. You can measure the time from the start of the reaction until the cross can no longer be seen. This is the rate of reaction i.e. the rate...
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