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In my investigation, I intend to find out what effect changing the concentration of sodium thiosulphate has on the rate of reaction between hydrochloric acid and sodium thiosulphate.

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Introduction

Plan of Experimental Procedures Preliminary Experiment Our teacher demonstrated the experiment for us. She drew an X on a piece of filter paper and placed it under a flask with sodium thiosulphate in it. She added the hydrochloric acid to the sodium thiosulphate. As the reaction occurred, the solution gradually became cloudy. We saw that the experiment �visible. Introduction In my investigation, I intend to find out what effect changing the concentration of sodium thiosulphate has on the rate of reaction between hydrochloric acid and sodium thiosulphate. Na2S2O3 + 2HCl � S + SO2 + 2NaCl + H20 Independent Variable to be Investigated In the experiment, the independent variable will be the concentration of sodium thiosulphate. This is so I can see the effect of changing the concentration of sodium thiosulphate on the rate of reaction between the sodium thiosulphate and hydrochloric acid. Theory I predict that the rate of reaction will be directly proportional to the concentration of sodium thiosulphate solution. ...read more.

Middle

Controlled Variables In this experiment I need to have a list of controlled variables so as to keep the experiment fair. My controlled experiments in this experiment are: 1. Temperature 2. Concentration of hydrochloric acid 3. Volume of acid 4. Type of acid 5. Size of and colour of X 6. Same glassware Dependant Variable The dependant variable in my experiment will be the time taken for the X to disappear. I will measure this with a stop watch and record the time taken in seconds. Apparatus * 3 burettes * 2 retort and clamps * 2 conical flasks * 2 beakers * Stop clock * Filter paper * Sodium thiosulphate (gdm-3) * Hydrochloric acid (2M) * Distilled Water Method I will be carrying out an experiment for five different values of concentration of sodium thiosulphate. I will repeat each of these five experiments twice. So in total I will be conducting fifteen experiments. In this experiment, I will mix the hydrochloric acid with the different concentrations of sodium thiosulphate solutions, and then take note of how long it takes until the X on the piece of filter paper underneath the flask to become no longer visible. ...read more.

Conclusion

Stop the stop clock. 10. Record results. 11. Repeat above steps for the remaining solutions of sodium thiosulphate. Strategy for Dealing with my Results Volume of 40 gdm-3 Na2S2O3 (cm3) Volume of Water (cm3) Concentration of Na2S2O3 (gdm-3) Volume of 2M HCl (cm3) Time T1 Time T2 Time T Av Rate 1/time (s-1) 50 0 40 10 45 5 36 10 40 10 32 10 35 15 28 10 30 20 24 10 Prediction I predict that as the concentration of sodium thiosulphate increases, the rate of reaction will also increase. I think this because the higher the concentration, the higher the amount of ions and the more energy they have. This means that the thiosulphate ions and the hydrogen ions will have the activation energy required to cause lots of successful collisions, and so the more successful collisions, the shorter the reaction time. I will use my results to find out if my hypothesis is true by plotting a point graph of rate of reaction (x-axis) against the concentration of sodium thiosulphate (y-axis). If my graph is correct then it will show that the rate of reaction is proportional to the concentration of sodium thiosulphate. ...read more.

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