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# To find out how the concentration of sodium thiosulphate affects the rate at which the acid turns cloudy.

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Introduction

Ian Craddock 10/12 To find out how the concentration of sodium thiosulphate affects the rate at which the acid turns cloudy. Variable: * Temperature. * Size of cross. * Colour of cross. * Amount of acid. * Amount of sodium thiosulphate. * Size of beaker. Prediction: By changing the concentration of the thiosulphate but keeping all other variables the same. I think that the more thiosulphate the longer it will take the acid to turn cloudy. If there is more acid to react with little thiosulphate it should take less time to turn cloudy. Experimental plan: I will measure the time it takes for a cross on the tile under the beaker to vanish, with different amounts of sodium hyposulphite being added. ...read more.

Middle

vii. Produce a graph and this investigation. Results: Amount of acid (ml) Test1 Test2 Test3 Average Mix of sodium thiosulphate Water (ml) thiosulphate 10 9.40 9.15 9.25 9.27 0 25 10 2.26 2.15 2.15 2.16 5 20 10 1.20 1.10 1.05 1.12 10 15 10 0.50 0.45 0.55 0.50 15 10 10 0.40 0.40 0.40 0.40 20 5 Results conclusion: As can be seen the graph goes down in a curve. The first result was very high compared with the others. It looks out of place so I think we may have used the wrong concentration of acid in the mix. My results support my prediction as the more thiosulphate there was in the mix the longer it took to turn cloudy. ...read more.

Conclusion

We undertook each experiment three times and then took the average, so as to try and eliminate some of the smaller inaccuracies and not to have as many mistakes that could have happened by doing only one experiment at each level of mix. The only reason all our results were not dead accurate was because the measuring and timing equipment we where using was not the best and relied on our eyesight and attention. We could over come some of the inaccuracies by using better and more precise equipment. We could carry out further experiments to extend this investigation by changing the amount of thiosulphate in increments of 1 ml instead of 5 ml's, this would make the final results show up any odd results a lot more than they do in my results now, and would also give us a greater range of figures to work with and from. 4 ...read more.

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