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Design an experiment to investigate the effect of varying the temperature of Sodium Thiosulphate solution on the rate of the reaction between sodium Thiosulphate solution and dilute hydrochloric acid.

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Introduction

Chemistry Coursework. Task: Design an experiment to investigate the effect of varying the temperature of Sodium Thiosulphate solution on the rate of the reaction between sodium Thiosulphate solution and dilute hydrochloric acid. P: Planning. The equation for the reaction is: Na2S2O3 (aq) + 2HCl(aq) 2NaCl(aq) + H2O (l) + SO2 (aq) + S (S) Sodium Thiosulphate + hydrochloric acid sodium chloride +water + sulphur dioxide +sulphur Variables Independent Variable = temperature Dependant Variable = rate of reaction Control variable = concentration, volume, sodium thiosulphate, hydrochloric acid. Prediction I predict that by increasing the temperature of the diluted sodium thiosulphate solution, and then adding it to the hydrochloric acid and the rate of reaction will be increased. I also predict that as the concentration of the sodium thiosulphate increases the rate of reaction will increase. This means that both graphs drawn up in my analysis will have positive correlation, and will probably be curved as the increase in rate of reaction will not be exactly the same as the concentration\temperature is increased. This can be justified because from my textbook I have found that when two chemicals react, their molecules have to collide with each other with sufficient energy for the reaction to take place. ...read more.

Middle

As his is happening I shall watch from above and stop the timer at the point when I can no longer see the cross. The results from the timer will be recorded. Precautions To prove that my results are correct, I will need to make a couple repeat readings to get an average temperature and an average time and to prove that each set of readings are correct. Because I am dealing with chemicals, and fire, I must make sure that I wear my laboratory coat and safety goggles, and ensure that my hair is tied back because acids are corrosive and fire will burn. I must also make sure that my heatproof mat is always under then Bunsen burner as it may get hot and burn the worktop. Fair Test To make sure that the test is fair, I must use the same thermometer; as if it is slightly different to another one then it will be constant all through the experiment. I must make sure that I mix the diluted sodium thiosulphate and the hydrochloric acid each time that I add them together. I must make sure that all of my solutions are measured properly; so that they do not differ from experiment to experiment, otherwise my test will not be fair. ...read more.

Conclusion

This is much more accurate than a thermometer reading. The plastic measuring cylinders we used to measure out our liquids are mass-produced and so are not 100 % accurate. A glass pipette should have been used as they are hand made and much more accurate. In addition, glass is clearer than plastic so you can take a reading of the liquids easier and more accurately. The substances we used were made from stock solutions, which were, made fresh every lesson therefore the concentration of these substances changed slightly from day to day during the experiment. The equipment was rinsed with tap water, which contains many impurities, which may have contaminated or changed the concentration of the liquids. Distilled water should have been used as it is pure and has no impurities but once again, I did not have the time to keep distilling more and more water just to rinse my equipment. I performed my experiment over two different lessons. This may have cause errors such as the rooms temperature may have varied, the exact concentrations of the acid and sodium thiosulphate may have changed, and I used different apparatus, which may have slightly varied if they had been made my different manufacturers. Davina West U5P 1 ...read more.

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