I am going to investigate what effect concentration has on the rate of reaction.

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Chemistry Coursework                                                     

Rate of Reaction

Planning

Things that affect the rate of reaction are:

  • Concentration
  • Temperature
  • Catalysts
  • Surface areas

I am going to investigate what effect concentration has n the rate of reaction.

I hypothesise that as the concentration becomes more diluted, the rate of reaction will increase. This is because when molecules in the reactants are colliding due to kinetic energy they don’t always react with molecules in other reactants.

When the concentration of the sodium thiosulphate is diluted, there will be more water and this will prevent the hydrochloric acid from reacting with the sodium thiosulphate as quickly. Water doesn’t react with acid.

The factor I will vary is the concentration of the sodium thiosulphate. This is because I am investigating the concentration so to alter the concentration I need to take out some sodium thiosulphate each time I do the experiment and add water to it each time as well.

I am using sodium thiosulphate with a concentration of 0.3   (20ml³ of sodium thiosulphate), 0.24   (16ml³ of sodium thiosulphate 4ml³ of water), 0.18   (12ml³ of sodium thiosulphate and 8ml³ of water), 0.12   (8ml³ of sodium thiosulphate and 12ml³ of water) and 0.06 (4ml³ of sodium thiosulphate and 16 ml³ of water.)

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The factors I will control are:

  • Temperature - all my experiments are going to be done at room temperature.
  • Volumes of the reactants – I will always use 10ml³ of hydrochloric acid and when I am changing the concentration of the sodium thiosulphate, it will always have a volume of 20ml³.
  • Equipment used – I will use all the same equipment i.e. stopwatch in order to keep this experiment as fair as possible and I will do this by just not changing the equipment.

The pieces of equipment I will use are:

  • Conical flask ...

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