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Investigate how changing the concentration of sodium thiosulphate affects the rate of the reaction with hydrochloric acid

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Introduction

AIM I aim to investigate how changing the concentration of sodium thiosulphate affects the rate of the reaction with hydrochloric acid. The reaction The reaction that will occur is a cross-drawn on a piece of paper disappearing because a precipitate (very fine solid) of sulphur is being produced as a waste product of the reaction. ...read more.

Middle

I will do my best to control the variables by using the same bottle of sodium thiosulphate I will use the same equipment as much as possible and will control the temperatures of everything and measure then out exactly. METHOD equipment: Conical flask 100mlMeasuring cylinder 10ml Measuring cylinder Thermometer Beaker Piece of white paper Marker (or pencil etc.) ...read more.

Conclusion

Then using your 10 ml measuring cylinder measure out 5ml of hydrochloric acid. Pour this into the sodium thiosulphate and start the stop watch, watch until the cross has dissapeared and then stop the stop watch. Record the time, then repeat this concentration two or three times to make sure there are no anomolous results. Then do the same experiment this time using the dilutions showen in the table, do each dilution two or three times. Hydrochloric acid Mean Total volume 1 2 3 50 45 40 35 30 ...read more.

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