An investigation into whether sodium Thiosulphate concentration affects the rate of reaction.

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Chemistry coursework                                        Robyn Hoaksey 11Oh

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An investigation into whether sodium Thiosulphate concentration affects the rate of reaction.

Prediction: I think that when there is a higher concentration of sodium thiosulphate the faster the reaction between sodium thiosulphate and hydrochloric acid will be. I think this because when there is a higher concentration of sodium thiosulphate, the more particles of sodium thiosulphate are and so more colliding with the acid making a faster reaction.

Low Concentration of Sodium                High Concentration of Sodium

        Thiosulphate.                                Thiosulphate.

Preliminary Work:  I thought that it would be best to have a test of the practical I would be doing. For this experiment, I took the highest and lowest amount of sodium thiosulphate. I also wanted to find out what amount of acid would be suitable for the experiment. We chose to use a 250ml beaker. This was so that the overall surface area would stay the same and would therefore keep the test fair.

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This was the result of my preliminary work:

These results are suitable for this experiment. This is because I Will be able to do a full set of results within an hour (This is my given time period) I chose to do both 10cm³ of acid and 15cm³ of acid to see which of the two would give a better result..

From my preliminary results I decided that it would be best to used 15cm³ of acid because it reacted with the sodium thiosulphate. Also I realised that every time I had done ...

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