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Science Rate Of Reaction

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Introduction

Aim: to investigate the effects of concentration, on the rate of reaction, between hydrochloric acid and sodium thiosulphate Scientific Knowledge: Sodium Hydrochloric Sodium sulphur water sulphur Thiosulphate acid chloride dioxide Na2s2o3 2hcl 2nocl s so2 h2o The collision theory believes that as the kinetic energy of particles increase so does the rate of reaction. Activation energy is the level of energy needed for a successful reaction to take place. For example the chemical reaction between methane and oxygen doesn't occur at room temperature but when heated they react. The reason for this is that some substances have extremely strong bonds which need more energy to break whilst others have weaker bonds which take less energy to collapse. ...read more.

Middle

4. Repeat steps 1, 2 and 3 using different concentrations of sodium thiosulphate solution. 5. Do all these steps three times to validate results. Prediction: I believe that as the concentration increases so will the rate of reaction. This is because from my research which is in my scientific knowledge I have seen that speed of a reaction increases with three thing and one of them is concentration. Safety: For safety reasons I will use the following: 1. Safety mat 2. Goggles 3. Apron 4. Gloves Fair test: In order to keep my experiment viable I will keep the following the same: Temperature: this is because from my scientific knowledge I have learnt that temperature can change the speed of a reaction Surface area: this is because from my scientific knowledge I ...read more.

Conclusion

This goes in line with my prediction. However there are some anomalous results which could have been caused by human error. One example is the error of the human eye and human reflexes. Evaluation: If I had the opportunity of expanding this experiment I would expand it to cover other concentrations of sodium thiosulphate I would also try and see what difference the concentration of hydrochloric acid would make to the rate of reaction. Also would experiment what the other variables would do to the experiment. In order to avoid the anomalous results I would connect a commuter to a light sensor and cover the light bulb with a box so no light is let out. ...read more.

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Here's what a teacher thought of this essay

3 star(s)

This is a fairly well written laboratory report. It covers some of the major factors associated with this type of investigation. Its main limitation is its brief conclusion and evaluation. There are more specific strengths and improvements suggested throughout.

Marked by teacher Cornelia Bruce 18/04/2013

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