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Rate of Reaction between Sodium Thiosulphate and Dilute Hydrochloric acid

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Introduction

The Rate of Reaction between Sodium Thiosulphate and Dilute Hydrochloric Acid. Plan Background:- The word equation for this experiment is: Sodium + Hydrochloric Sodium + Sulphur + Sulphur + Water Thiosulphate Acid Chloride Dioxide I was told the word equation by my teacher but to find the balanced equation I searched the internet. It is as follows: Na S O + 2HCl 2NaCl + SO + H O + S Aim:- I will be investigating the effect of the two reactants; 'Sodium Thiosulphate' and 'Dilute Hydrochloric Acid' when the amounts of these are varied. The investigation is to observe the speed of these reactants, and to do this we see how long the cross is clear until the sulphur covers it. Safety:- Precautions that will have to be taken in order to keep myself and others around me safe are as follows: * Wear goggles at all times to keep any chemicals from entering my eyes-especially as I am working with chemicals such as hydrochloric acid which can be harmful. * When I am finished with a chemical I must close it to avoid any accidents/spillages. * Nobody should be running in the lab because accidents are caused that way. * I will need to be focused on the task at hand so no mistakes/accidents occur to me or anyone else. Apparatus:- 1 Conical Flask 2 Measuring Cylinder (10ml/50ml) 3 A cross 4 Stop Clock 5 Distilled Water 6 Dilute Hydrochloric Acid (1 molar) ...read more.

Middle

This will help me to compare all of my results. The amount of Sodium Thiosulphate (x-axis) against time (y-axis). Method:-(what actually happened) 1. Firstly, I gathered all my equipment that I needed for the experiment. This helped me as I was more organised and also it saved me time during the investigation by not constantly getting up to get things. 2. Next, I measure out the distilled water and Sodium Thiosulphate in the 50ml measuring cylinder and the acid in the 10ml cylinder because the amount of acid that I needed to obtain was a lot less. This helped me to be more accurate about the quantity of acid I had to use. Also when I measured out the reactants, I did this at eye level to improve the level of accuracy again. 3. I poured the water in the conicle flask (which was on top of the cross) and then poured the Sodium Thiosulphate and the acid in at the same time so I could be sure that the reaction started at that exact moment. Then I began the stop clock. 4. I didn't stir the solution because I didn't think to do that when I did the first experiment and as I have to do the same thing to each one to make it a fair test, I decided not to stir the others. 5. I repeated each amount 3 times in order to get an average. This helped me to see whether my results were reasonable compared to other results that I had obtained for those particular quantities. ...read more.

Conclusion

I thought that my method was reasonable. It was the best way to do it with the equipment that we had to do it with and the time allowed. In my opinion the way that we had to observe the results was not very accurate and I think that shows in my results with the one incorrect time. I could have improved my method and maybe therefore improved my accuracy with my results by stirring the solution as I had initially planned to do. This may have been a factor in my overall experiment. If I had to redo the investigation, and if I had more time I would have chosen my own amounts of each reactant to use by doing some preliminary work. I think this may have made me understand the task at hand a little better than someone giving me the amounts and then carrying out the experiment. I thought that my results were quite fair, especially with the 1/time graph. Some of the points weren't on the trend line/line of best fit but the majority of them were on it. The others however were still close to the line to indicate that there was in fact a trend that all the points were following. To extend on the experiment that I have just completed, I would have used a different method of gaining my results for example data logging which uses the computer to work out a more accurate time than merely using my eyes. The computer can therefore be more precise in detecting the amount of sulphur produced that covers the cross than human intervention. Chemistry Coursework Phillippa Lyras 11.1 8/2/05 ...read more.

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