The effects of concentration on the rates of reaction

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Experiment:  The effects of concentration on the rates of reaction

AIM: I am investigating the effects of the change in the concentration of a chemical on the rate of reaction

PREDICTION:  I predict that by increasing the amount of thiosulphate this will speed up the rate of reaction between the chemical and the acid.

BACKGROUND THEORY

There are many ways in which to effect the speed in the rate of reaction.  These include:

  1. Temperature – By increasing the temperature the faster the particle moves and the more collisions occur and this speeds up the rate of reaction.
  2. Surface area – There are more particles that are able to react and therefore an increase in the surface area leads to a increase in the rate of reaction
  3. Concentration – The higher the concentration the more collisions that occur and the faster the reaction
  4. Catalyst – By introducing a catalyst this will increase the rate of reaction.
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The way in which we intend to effect the rate of reaction in this experiment is by increasing the concentration of thiosulphate.

It is possible that the ambient temperature may also effect the results if the temperature of the solution in the test tube increases.  One way to ensure a fair test is to place a thermometer in the flask and note any changes that occur.

EQUIPMENT

Burettes x 2

Pipette x 1 (10cm3)

Pipette filler

Hydrochloric acid

Sodium thiosulphate

Distilled water

Clamp stand

Stop clock

Conical flask

Beaker

Goggles and laboratory coat

Funnel

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