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The Effects Of Change In Concentration On The Rate Of Reaction Between Sodium Thiosulphate And Hydrochloric Acid.

1764 words - 7 pages

GCSE SCIENCE COURSEWORK (CHEMISTRY)PLANNING: Skill Area PWrite down the aim of your Investigation.To investigate the effects of change in concentration on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid.Briefly describe your Preliminary Experiment and include your results. Explain how these results have helped you plan your main experiment (p8b).An increase in concentration will lead to an increase in the rate of reaction because there will be a greater number of particles per unit/cm3. The particles will be closer together and have greater chance of colliding and therefore reacting. The activation energy barrier is more likely to be overcome when particle with greater energy react therefore collisions are more likely to occur. This can be justified by relating to the Collision theory, which is that '...before we can get a chemical reaction, particles must crash together...' with enough energy. Molecules exceeding the activation energy collide together to initiate the reaction. They must be also correctly orientated in order to successfully collide. This means that the graph drawn up in my analysis will have a negative correlation, because as one variable increases the other one decreases. In this case as concentration increases the time taken for the reaction to occur will decrease. The graph shown below is taken from my preliminary experiment's results and supports this argument.Volume ofdilute HCl(cm3) Volume of 40g/dm3Sodium Thiosulphate Volume ofWater(cm3) Time taken for Crossto disappear(sec)5 50 0 315 40 10 395 30 20 525 20 30 555 10 40 89List all the apparatus that you now plan to use (diagrams should be included) (P4b).Based upon my preliminary experiments I decided on using the following apparatus:x1 stopwatchx1 thermometerx2 measuring cylindersx1 conical flaskx1 beakerx1 X boardx1 pair of gogglesx1 apron240cm3 of hydrochloric acid900cm3 of sodium thiosulphate1500cm3 of distilled waterDescribe the method you plan to use, include all safety precautions (p4a)1. 110cm3 of sodium thiosulphate solution will be used each time, but at varying degrees of concentration. The first solution then, will compromise 10cm3 of 40g/dm3 sodium thiosulphate, which in a conical flask, and then 100cm3 of water will be added to complete the solution. 10cm3 of dilute hydrochloric acid will be poured into a separate measuring cylinder.2. The flask is placed on the X board. The acid is poured into the flask which has the sodium thiosulphate solution in it.3. As the hydrochloric acid mixes with the sodium thiosulphate and the water in the flask, the stopwatch is started. The flask is viewed from the top and then as the cross disappears the stopwatch is stopped and the time recorded.4. These steps are to be repeated but the concentration of sodium thiosulphate will be varied. This will be done by mixing different volumes of the original sodium thiosulphate solution with water.5. The whole procedure is repeated twice more and an average value...

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