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Investigating The Affect Of Concentration On The Rate Of Reaction.

1168 words - 5 pages

Investigating the affect of concentration on the rate of reactionIntroduction:This investigates how the rate of a chemical reaction depends on the concentration of reactants in the solution. This will be investigated with the following experiment in which dilute hydrochloric acid and sodium thiosulphate solutions are mixed. This forms insoluble sulphur and the mixture gradually becomes cloudy.If the concentration of the sodium thiosulphate concentration is varied, the rate of production of sulphur can be measured by recording the time taken for the reaction mixture to go cloudy.The rate of the formation of sulphur can be measured using a light sensor and measuring the time taken for the light transmitted through the solution to form by 10%.Method:Having set up the apparatus as shown in the given diagram, carry out the following steps.THE EXPERIMENT:1)Get the apparatus together and for the first experiment, measure the appropriate amount of the solutions (5cm" of hydrochloric acid, 50cm" of 0.15 molar sodium thiosulphate and 0cm" of water). Add the hydrochloric acid after the light has been trained onto the conical flask containing the other two solutions and the light getting through is at around 85%.2)Then add the dilute hydrochloric acid and start the logit to collate the results.3)Stop the logit after the amount has dropped to 75% of the light getting through to the sensor.4)Then for the rest of the experiments remember the 5cm cubed of hydrochloric acid (it is 2molars in strength) and mix up the correct solution (amount 50cm") of sodium thiosulphate: water.These are the ratios in which the solutions should be made:ExperimentVolume of 0.15M sodium Volume of waterthiosulphate (cm") (cm")1 50 02 40 103 30 204 20 305 10 40Conclusion:As the reaction proceeds, the concentration decreases and therefore fewercollisions take placeI can see from the graph that shows a trend line for the results, that the more concentrated the solution of sodium thiosulphate, the faster the rate of reaction with the dilute hydrochloric acid. This is because when the sodium thiosulphate is more concentrated, there are more particles of it and so the dilute hydrochloric acid particles have more of a chance of colliding with these other particles, therefore causing a reaction to take place.Looking at the line of best fit on my graph, it is a straight line and not a curve. This means that the concentration and rate of reaction are indirectly proportional. This is because if you increase the concentration, the rate or reaction decreases, and if you decrease the concentration, the rate of reactionIncreases.Evaluation:The advantages and disadvantages of both the computer methods over the pen and paper ones:Light sensor and logit versus a cross on the conical flask:1) LIGHT SENSOR AND LOGIT:Advantages::It is completely accurate:As long as the apparatus is set up correctly, you can not ruin the experiment:It is possible to see exactly when there has been a 10% decrease in...

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