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Investigate the effect of the concentration of sodium thiosulphate on the rate of a chemical reaction.

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Rate of Reaction Investigation Samuel Bell 10 Elm. Aim: To investigate the effect of the concentration of the sodium thiosulphate on the rate of a chemical reaction. Background Theory: The rate of reaction depends on how often the particles collide. If you increase the temperature the particles have more energy causing them to move quicker thus meaning they react quicker. If the concentration is increased the particles are more likely to collide, because there are more particles. If the sizes of the solid particles are broken up into smaller pieces the solution will react quicker because there are more particles. Also if a catalyst is used this increases the rate of reaction. It does this by creating a surface for the particles to stick to. The formula for this reaction is: Variables: The Dependant variables are: How long the cross (which is drawn on the paper) takes to disappear. The Independent variables are: The concentration of the sodium thiosulphate added to the experiment. ...read more.


4. Add the acid and start timing simultaneously. Stir the solution for ten seconds. 5. Stop the timer when the cross has fully disappeared. 6. Repeat this three times for each measurement to ensure fair results. 7. Repeat all points only changing the concentration where needed. Concentrations of sodium thiosulphate: Volume of acid (cm�) Volume of thiosulphate (cm�) Volume of water (cm�) Concentration % Molarity (m) 10 10 0 100 0.15 10 8 2 80 0.12 10 6 4 60 0.09 10 4 6 40 0.06 10 2 8 20 0.03 Safety: To ensure that the experiment is performed in a safe environment, I will follow these safety rules: 1. Wear goggles at all times 2. Tie back hair, or remove loose clothing (i.e. tie) 3. Store bags and coats in a cupboard out of the way. 4. Move carefully around the lab, No running. 5. Clean up any spillages and immediately inform a teacher. Results: Concentration % Time(seconds) ...read more.


I think that I should have used five different conical flasks for the five different concentrations because this would be fairer and there wouldn't be any water at the bottom of the beaker. If I was to do the experiment again I could improve the accuracy and reliability of my results by having a wider range of different concentrations. Also I could use the same amount of beakers for the number of different concentrations I use. If I had more time I could do extra experiments to investigate another factor such as the affects of temperature on a rate of reaction. Also I could investigate the affects of pressure on a rate of reaction. Also I would arrange so the experiment could be carried out on the same day. This could make the results more accurate. This could not be carried out since our lessons are only fifty minutes long. Furthermore I could use more sophisticated equipment. This would clear any discrepancies with the judging of the disappearing of the cross. Light sensors could be used. ?? ?? ?? ?? 1 Samuel Bell 10 Elm ...read more.

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