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Rates of Reaction

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Introduction

Rates of Reaction Investigation You are to plan obtained evidence, correctly presented and use it to draw conclusions and evaluate your work. You are to study the effect of concentration on the reaction of hydrochloric acid and sodium Thiosulphate. This reaction produces a white solid witch clouds the mixture. (The scientific word for this is precipitate.) The gas sulphur dioxide is produced. Prediction: I predict that as the water dilutes the volume of the thiosulphate, it will take longer for it to change into a cloudy mixture. Explanation: The reason why a fink this is because, the lower the concentration the less particles there are to collide with each other. ...read more.

Middle

Repeat the experiment like shown on the results table. 4 Start stopwatch, and mix the contents of the conical flask 10 times in an anticlockwise direction. 5 When the solution turns cloudy, so that you can't see the 'X' stop the stopwatch and record the time. 6 Check and control the temperature to make a fair test. Risk Assessment The first thing I am going to do is look up all the possible dangers when doing the experiment. I am to do a list of all the dangerous chemicals, which I am, using and what chemicals are produced. Using 1 Sodium Thiosulphate 2 Hydrochloric Acid Produced - Sulphur dioxide Sodium Thiosulphate Sodium Thiosulphate have mineral hazards but are only harmful if ingested in large quantity, ...read more.

Conclusion

The other two results were anomalies I think this because the readings may have been wrote down incorrect or when the Thiosulphate, Hydrochloric Acid or water was measured incorrect. To improve this if I was going to do the experiment again I would ask someone to check the times and the measurements, and get the same person to see if the mixture was cloudy and try and do it from the same eye level. Overall a think that the evidence was sufficient because nearly all my results were accurate, and it supports my prediction. "As the water dilutes the volume of the Thiosulphate, it will take longer for it to change into a cloudy mixture." ...read more.

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