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Effect Of Concentration On The Rate Of Reaction between Sodium Thiosulphate & Hydrochloric Acid.

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Introduction

Name : Maged Shereen Class : 4/8 Activity : C5.01-05 Dated : 10-4-2003 Coursework Assignment Effect Of Concentration On The Rate Of Reaction between Sodium Thiosulphate & Hydrochloric Acid Rate Of Reaction Between Sodium Thiosulphate & Hydrochloric Acid I. (PLANNING( Introduction The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. It is measured by dividing 1 by the time taken for the reaction to take place. There are seven factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface area (of solid reactants), presence of catalysts, light intensity (for some reactions), and the nature of reagents. I have chosen to investigate the effect of concentration on the rate of reaction, because it is the most practical to investigate. It is difficult to get accurate readings due to the inevitabilities of human errors, and as gas is mostly colourless it is difficult to gauge a reaction changing the pressure. If a substance is added to give the gas colour, it may influence the outcome of the experiment. Similarly, the use of a catalyst complicates things and if used incorrectly it could change the outcome of the experiment. ...read more.

Middle

I will Leave the conical flasks for about 30 minutes before mixing the reactants reagent in order to have the same initial temperature (room temperature). I will not hold the conical flasks with your hands during the experiment to avoid heat transfer. The stopwatch will be started at the exact time as we put HCl into the conical flask. 7- Prediction I predict that as the concentration of Na2S2O3 increases, the rate of reaction will increase. I predict this, because on increasing the concentration of the reagents, there will be bigger number of colliding particles per unit volume, so there is more frequency of successful collisions, and the reaction goes faster decreasing the time needed to obscure the cross. If the concentration of Na2S2O3 doubles, I predict that the rate of reaction will also double. 8- Resources * http://www.edexcel.org.uk * http://www.essaybank.co.uk./GCSE/chemistry_coursework * Dr Nabil Sobhy, chemistry notes OL, Dar Eltarbiah, Year 2002-2003, page 118, 122,123. II. (OBTAINING EVIDENCE( Precautions (a) For personal safety ? Wear safety goggles to protect your eyes from chemical splashes. ? Taking care when handling chemicals, particularly Hydrochloric acid because it is a corrosive. (b) For accurate results ? There should be a contrast between the black cross and the white paper in order to make the cross quite obvious. ? Leave the conical flasks for about 30 minutes before mixing the reactants reagent in order to have the same initial temperature (room temperature). ...read more.

Conclusion

I do not have any anomalies results, which do not fit in the pattern because my predictions coordinated with my results very well. My method of carrying out the experiment was fairly accurate. I made sure to wash the beakers carefully for the two levels of concentration. The second experiment, I measured the same amount of solution in each time and stopped the stopwatch as soon as I observed the cross disappearing. I think that I should have used five different beakers for the five different concentrations because this would be more accurate, fair as the beakers will be dry. If I was to do the experiment again, I could improve the accuracy and reliability of the results by having a range of different concentrations. Also I could use the same amount of beakers for the number of different concentrations I used. If I had more time, I could do additional experiments to investigate another factor such as the effects of temperature on the rate of reaction. Improvements that could be made to this experiment: To repeat this experiment several times and record more averages in order to obtain a higher degree of accuracy. In my experiment, temperature and exact quantities could not be possibly obtained. On the whole, I believe this experiment was carried out to the best of my abilities, and is the optimum performance using all possible resources and time available. The results obtained, which seem reliable, supported my predictions. - 1 - 10 O.L. Chemistry 1/7 Coursework ...read more.

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