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Investigating the effect of changing one of the factors in the reaction between Hydrochloric acid and sodium thiosulphate.

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Introduction

Investigating the effect of changing one of the factors in the reaction between Hydrochloric acid and sodium thiosulphate. Aim: The aim of this investigation is to investigate the factors that effect the reaction between hydrochloric acid and sodium thiosulphate. The main factors are concentration and temperature. I will be looking at concentration. Background knowledge: Increasing the concentration of a substance in a solution means that there will be more particles per dm3 of that substance. The more particles there are, the more will that will collide per second, and so the rate of the reaction increases. In the reaction between sodium thiosulphate solution and dilute hydrochloric acid, increasing the concentration of sodium thiosulphate means that there will be less time before the cross can no longer be seen (the sulphur will be produced more quickly). ...read more.

Middle

What I think would happen is that the bonds will break and more bonds will be made therefore increasing the reaction. Method: :) I will make a copy of a table, to put my results in. :) I will then measure out 50cm3 of sodium thiosulphate and put into a measuring cylinder, I will then pour it into a conical flask, I will keep this measuring cylinder for sodium thiosulphate only, otherwise if it mixed with the hydrochloric acid it would effect my results and not make it a fair test. :) On a piece of paper/card I will draw a THICK black cross, then I will stand the conical flask over the cross. :) I will then measure 5cm3 of bench hydrochloric acid in a measuring cylinder; this cylinder will be only used for hydrochloric acid. ...read more.

Conclusion

:) The background will stay the same, and the place will stay the same as well, because the light might be different in a different place and this will affect the results, the weather can also affect the results. :) The cross will stay the same colour and thickness; I will always go over it before every test as it might begin to wear off with the water, acid and sodium thiosulphate. Pre-test 1: TEST Sodium thiosulphate Hydrochloric acid Water Time taken for cross to disappear 1st 50cm3 5cm3 NONE 32.39 2nd 40cm3 5cm3 10cm3 37.41 3rd 30cm3 5cm3 20cm3 50.28 4th 20cm3 5cm3 30cm3 1:35.68 Conclusion of my pre-test My results show me that there is a pattern happening; it's not an obvious pattern but you can clearly see that the time is going up as I dilute the sodium thiosulphate. Mel Cleal 11ms 16-10-02 ...read more.

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