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rate of reaction

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Introduction

Rate of reaction The rate of reaction is how quickly a reaction takes place and the rate of the transformation of a product throughout a chemical reaction. The rate of reaction is measured by dividing 1 by the time taken for the reaction to take place. If a reaction has a low rate, that means the molecules unite at a slower speed, than a reaction with a high rate. Aim The aim is investigating the rate of reaction between Sodium Thiosulphate and Hydrochloric acid, and the effects of changing the concentration have on them. The equation for the reaction between Sodium Thiosulphate and Hydrochloric acid is: The sulphur created appears in the form of very small particles of solid. This leaves a white/yellow precipitate. Safety There are a lot of safety issues that we have to be careful with, as things are very unpredictable. It is important to wear goggles throughout this experiment, as it will protect the eyes. We must be careful with the chemicals, and not eat or drink in the science lab as we can get chemicals on to our hands. We should also dispose the mixture of chemicals of down a well-flushed sink. ...read more.

Middle

* I will keep the volume of sodium thiosulphate at a regular amount throughout the experiment; otherwise this would make the results inaccurate. * I must make sure that the conical flask is rinsed well and clean before use; otherwise it could affect the results of the experiment. * I will make sure, that I add the sodium thiosulphate and the hydrochloric acid in the conical flask at the same order as usual. * I will laminate the cross and make sure that I keep the same one throughout the experiment. * I must start the stopwatch at the exact time as we put the sodium thiosulphate and hydrochloric acid into the conical flask. Reliability To make sure that my results are reliable, my measurements have to be precise and accurate. * I can do this by repeating the experiment 3 times. * I will be using the same measurement each time for deciding when the cross has disappeared. * I will also use a digital stopwatch, as it is more accurate than a manual stopwatch. * I will ensure to do the same experiment on the same day and in the same lesson so the temperature stays the same at 20�C and doesn't affect my results. ...read more.

Conclusion

This tells us that increasing the concentration would lead to more collisions and therefore the rate of reaction would occur faster. For example, by doubling the amount of concentration, it would double the amount of reactant particles. This would lead to more collisions taking place, and therefore the cross will disappear quicker. My results of my experiment support my prediction of the rate of reaction increasing, when the concentration of HCL acid is increased too. Evaluation I carried my experiment the way I intended to, and my results were accurate enough to prove the prediction. The points on my graph gave the accepted straight-line and curve to give an idea of a relationship; which means I did not get any anomalous results. However, they could be improved to drop on a straighter line as some points didn't drop on the line as it usually would. I could do this by: * Doing the experiment more times, to give more accurate results. * Measuring the solution more accurately. * Taking a more precise reading when deciding, that the cross has disappeared. * Using dry conical flasks for each experiment. I would be more precise with these points, as this would again improve accuracy. ?? ?? ?? ?? Yasmin Ramadan Year 11 Candidate No.: 3501 1 ...read more.

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3 star(s)

This report is well written but brief. The data collected covers the appropriate range with regular checks for reliability. There are specific strengths and improvements suggested throughout.

Marked by teacher Cornelia Bruce 17/04/2013

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