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An investigation to show how the rate of reaction between hydrochloric acid and sodium thiosulphate is affected by the concentration of the acid

Simple Procedure
Place a conical flask on a piece of paper with a cross on it. Add hydrochloric acid and sodium thiosulphate, and record the amount of time taken for the cross to disappear through the solution from the top of the flask. Record this time and repeat this for different concentrations of hydrochloric acid.

Fair Test
The variables in this test are:
• The concentration of hydrochloric acid
• The concentration of sodium thiosulphate
• The amount of hydrochloric acid
• The amount of sodium thiosulphate
• The temperature
• The surface area of the reactants
• The size and colour of the cross
• The size of the conical flask

To keep this test fair the concentration of the hydrochloric acid will be the variable that will be changed and all of the others will be kept consistent. The same person must do the......

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Approximate Word Count: 864
Approximate Pages: 4 (250 words per double-spaced page)

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