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# Investigation to see how the concentration affects the rate of reaction

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Introduction

Investigation to see how the concentration affects the rate of reaction Aim: To find out how concentration affects the rate of reaction. Background Knowledge: A reaction is a change or transformation in which a substance decomposes, combines with other substances or interchanges constituents with other substances. Things that change the rate of a reaction are; Temperature - Heat makes the particles move around quicker, therefore making the reaction take place quicker. So as temperature is increased so is the speed of the reaction. Concentration - The higher the concentration the quicker the reaction will be, this is because there are more particles to react with. So as the concentration is increased so is the speed of the reaction. Catalysts - Are substances that increase the rate of a reaction but does not get used up in the reaction. It can be used over and over again. Surface Area - The larger the surface area the quicker the reaction, this is because there is larger amount of surface for the reaction to happen. ...read more.

Middle

Method: Use a burette to measure 40cm� of water, pour into a conical flask. Then measure 10cm� of Sodium Thiosulphate using a burette and add to the conical flask. Swirl the flask to mix the solution. Measure 5cm� of dilute Hydrochloric Acid using a syringe. Place the conical flask onto a piece of paper marked with a cross. Add the 5cm� of dilute Hydrochloric Acid. Swirl the flask and start the stopwatch. Look through the solution from the top and stop the stopwatch when the cross on the paper disappears. Repeat using the different concentrates of Hydrochloric Acid. Fair Test: To make our investigation a fair test we will measure the Sodium Thiosulphate, water and different acid concentrations accurately. We will do this by using a burette when measuring the Sodium Thiosulphate and water, by doing this we are making sure the measurements are completely accurate, by using a burette it is more accurate than a measuring cylinder because the measurements are in more detail. ...read more.

Conclusion

Average (Secs) 0.25 642 382 364 463 0.5 385 276 260 307 0.75 293 240 226 253 1 245 233 184 221 1.5 237 191 169 199 2 205 162 150 172 Conclusion: My results fit with what I said in my prediction because I predicted that the higher the concentrate of the acid the quicker the reaction would be, and this is proved in the results. When the concentration is at its lowest it took 463 seconds on average and at the highest concentration it only took 172 seconds on average. This is because the higher the concentrate the more particles there are to react with, hence a fast rate of reaction. Evaluation: I could improve my experiment by measuring the temperature of each solution before the experiment, this would make it a much fairer test. We could also use light meters so when it gets to a certain amount of light we stop the timer, this would increase the accuracy of the experiment. Most of the results fitted well as we didn't have any anomalous results. I am pleased with how the experiment went. ...read more.

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