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Aim:The main point of this experiment is to find out how the concentration of sodium thiosulphate affects the rate of reaction.

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Introduction

Investigating the Rates of Reactions Aim: The main point of this experiment is to find out how the concentration of sodium thiosulphate affects the rate of reaction. Apparatus: Here is a list of apparatus I will need: * A flask * Safety goggles * Sodium thiosulphate * Hydrochloric acid * Paper with a cross on * A measuring cylinder * Water Method: Here is a list of variables I have identified: * Temperature * Amount of hydrochloric acid * Ratio of sodium thiosulphate to water * Concentration of the hydrochloric acid * Number of times stirred The variable I am choosing to alter is the ratio of sodium thiosulphate to water because it is the easiest and safest to control and measure. ...read more.

Middle

Fair Test: I will keep this experiment a fair test by controlling as many variables as possible: * Temperature * Amount of hydrochloric acid * Concentration of the hydrochloric acid * Number of times stirred It is important to keep these variables the same because otherwise it will affect my results' accuracy. Safe Test: I will make sure the experiment is conducted safely by making sure all involved are wearing safety goggles and that the workspace is clear. Prediction: I predict that the highest concentration will have the fastest reaction time because there are more particles to react with. ...read more.

Conclusion

This increased the rate of reaction because it was more likely that the particles would collide with enough force that they would react. My prediction was partly correct. I believe that the concentration '6' should have been closer to 33.5 than 28, however this doesn't make too much difference to my results. Evaluation: I think that my experiment was, on the whole, a fair test. There was a slight discrepancy but this did not affect my results too much. I believe that the anomalous results were caused by contaminated equipment. I think that my results were accurate because they were repeated several times. I could have improved my investigation by using sterile equipment. I could also used different flasks each time to prevent contamination. If I had used smaller flasks, the reaction would have probably worked better. ...read more.

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