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Sodium thiosulphate reacts with hydrochloric acid to produce a yellow precipitate of sulphur.

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Introduction

Sodium thiosulphate reacts with hydrochloric acid to produce a yellow precipitate of sulphur. We can follow the rate of a chemical reaction by timing how long it takes for the sulphur to obliterate a cross drawn on a piece of paper. Aim To see how the concentration of sodium thiosulphate changes the rate of reaction. Prediction I predict the more concentrated the sodium thiosulphate is the faster the cross will disappear therefor the faster the rate of reaction will be. I think this will happen because the higher the concentration the more sodium thiosulphate particles there will be to collide successful with the acid, to cause a greater chance of a successful collision. ...read more.

Middle

Measure 50cm3 of sodium thiosuiphate accurately in a measuring cylinder. Put it into a conical flask. Put the conical flask onto the cross. Measure 5cm3 of hydrochloric acid accurately in a different measuring cylinder so the reaction does not take place in the cylinder. Measure the temperature. Put the acid to the conical flask and start the stopwatch. Stop the stopwatch when the cross disappears. Put the results into a table. Repeat the experiment, change the concentration of the sodium thiosulphate, and keep the temperature the same. Do the whole Experiment twice. Sodium Thiosulphate Cm3 Water Cm3 40 10 30 20 20 30 10 40 0 50 Fair test To make it a fair test I will keep the following variables the same: 5cm of Hydrochloric acid, total volume, heat. ...read more.

Conclusion

This is because when the concentration of sodium thiosulphate is increased there is more sodium thiosulphate particles to collide sucsesfully with the acid to cause a reaction thus rate of reaction is increased as shown by my graphs, as the concertration increases show does the time. 1\time graph shows the volume of sodium thiosulphate is directly proportional to the speed of the reaction. As you double the volume of sodium thiosulphate the reat of reaction of reaction doubles.e.g. 10 times 2 = 20, 0.05 times 2 = 0.1 Evaluation To improve my reasults I would take some more readings between 20 - 10 cm3 concertration of sodium thiosulphate because there is a big gap in my reasults. I would extend my investigation I would use different pH of acid and keep the concertration of sodium thiosulphate the same. ...read more.

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