Reaction times of Sodium Thiosulphate and Hydrochloric acid

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Vincent Clegg

Reaction times of

 Sodium Thiosulphate and Hydrochloric acid

Introduction

I am going to perform an experiment  involving sodium thiosulphate and hydrochloric acid.  The experiment is to see how fast the two of them will react.  The reaction which will be taking place is this:

Sodium Thiosulphate + Hydrochloric Acid  =  sodium chloride + water + sulphur dioxide + sulphur                                              Na2 S2 O3 (aq)  +       2H Cl (aq)   =         2Na Cl (aq) + H2 O (l) +     S O2  (g)       +     S                                        

 I am going to do this by placing a piece of paper underneath the  conical flask with a cross drawn on to it with permanent marker and by using a stopwatch seeing how long it will take for the cross to disappear. The cross disappears because as the sodium chloride is produced it dissolves into the water making it go cloudy.

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                        I will be changing the temperature of the hydrochloric acid but I am not going to change the temperature of the sodium thiosulphate.  The amount that I will use is 25 cm³ of 2 mol hydrochloric acid and 25 cm³ of 2 mol sodium thiosulphate.  This will not be changed.  I will also use different measuring cylinders for them both because the reaction will start to take place too soon.                        The equipment that I will use is:

  • 1 x beaker
  • 1 x tripod
  • 1 x gauze
  • 1 x conical flask
  • 1 x bunson burner
  • 1 x piece of paper with ...

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