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Investigation on the rate of Reaction of Sodium Thiosulphate and Hydrochloric Acid

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Investigation on the rate of Reaction of Sodium Thiosulphate and Hydrochloric Acid I am investigating the effect of the concentration on the rate of reaction of sodium thiosulphate and hydrochloric acid. I predict, due to my own knowledge on the variables that affect the rate of reaction, that if the experiment takes place fairly and accurately, the higher the concentration of sodium thiosulphate in a solution with water and hydrochloric acid, the higher the rate of reaction for this experiment will be. Plus, the more concentrated the solution, the less time it will take for the cross to become fully hidden by the formed sulphur. For this investigation to take place I will need the equipment listed below: * 1 conical flask to contain the solution * 1 cross on paper to be the same every time * 1 stop clock to measure the time taken for the solution to become so concentrated with sulphur that you can not see the cross * 3 syringes to measure accurately the amount of each solution. * 1 measuring cylinder * Hydrochloric acid 2M * Sodium thiosulphate at the concentration of 10g/1 litre * Water The independent variable used in this experiment is the concentration of thiosulphate in the solution. The controlled variables I used in this experiment are: * The person looking at the cross - they cannot change as different people have different eyesight and so the test would be unfair as some people will see the cross after others think its gone and vice-versa. ...read more.


Once the cross disappeared due to sulphur forming in the solution I stopped my stop clock and wrote down the time taken to hide the cross. I repeated this 3 times. After that I put 45 cm3 of sodium thiosulphate into a clean conical flask but this time I added 5 cm3 of water and 5 cm3 of hydrochloric acid to it at the same time, then once again started my stop clock. To ensure the test was as fair as possible, I once again repeated it 3 times. I then repeated each the same for the other 3 rows in my table below. Once this was complete and I was convinced it had been as fair as possible I then washed by equipment and put it all pack in the correct place and washed my hands to be sure there was no solution on them. Range of Concentrations Sodium thiosulphate (cm3) Water (cm3) Concentration (g/litre) 50 0 10 45 5 9 40 10 8 35 15 7 30 20 6 Conclusion of my Investigation on the Rate of Reaction and its Affecting Factors I have completed my investigation and have investigated fully what affects the rate of reaction. My graphs on the rate of reaction compared to the concentration and the time taken to hide the cross fully compared to the concentration show that what I predicted was correct. ...read more.


In order to improve my test results if I was to do it again, I and my team mate would have to keep the test fair by keeping the same person watching the cross. Also to improve my experiment results I would conduct my experiment in an area of the classroom were it could not be affected by heat radiation from the sunlight, such as a corner of the classroom were sunlight is blocked by a bookcase or filing cabinet. One further way that I could improve my experiment would be by using a colorimeter rather than eyes to detect when the cross is completely covered by the formed sulphur. A colorimeter is a device that measures the amount of light that travels through something. By using one of these it would improve the accuracy of the test by telling us when no light gets through to the cross on the paper below the conical flask. When no light is detected, that is when the cross is fully hidden by sulphur. Apart from those I would keep everything in my test the same as I have written and would still exercise the same amount of safety I used during this experiment, such as wearing safety glasses again and washing hands as soon as possible after the experiment to ensure no hydrochloric acid or sodium thiosulphate I left on or it could result in injuries such as acid burns. ?? ?? ?? ?? Ryan Nelson 10V2 ...read more.

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