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The aim of my investigation is to find out the effect of temperature on the rate of reaction.

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Introduction

The Disappearing Cross Background Information Sodium thiosulphate Na2S2O3 reacts with hydrochloric acid HCl as follows. Word equation Sodium + Hydrochloric -> sodium chloride + Thiosulphate acid sulphur + sulphur Dioxide + water Balanced Equation Na2S2O3 + 2HCl(aq) -> 2NaCl(aq) + S(s) + SO2(g) + H2O(l) When the reactants are mixed together the solution becomes cloudy because sulphur is precipitate. As the precipitate gets thicker, ink cross of a piece of paper below the flask disappears. The aim of this investigation is to study in detail the effect of a variable on the rates of reactions. Aims The aim of my investigation is to find out the effect of temperature on the rate of reaction. Prediction I predict that as temperature increases the rate of reaction will also increase. ...read more.

Middle

The yellow is a collision between a blue and red molecule. This is a diagram to show Collisions at 60�c. Equipment list 2m-hydrochloric acids, 0.05m sodium thiosulphate, Water bath, (electrical) Conical flask x1 250cm3, Thermometer, Piece of paper with an X on it, Stopwatch, 20cm3 measuring cylinder, Safety goggles, Diagram Stopwatch <-- Conical flask <-- Solution containing -> 5cm3 hydrochloric acid Paper with x on it and 50 cm3 sodium thiosuphate Safety > Hydrochloric acid is corrosive; all spills must be reported and cleaned up immediately. > Sodium thiosuphate (L) is contained in a dark glass bottle to prevent light breaking the bonds. > Safety goggles must be worn at all times. > Must be careful with hot water bath. Preliminary work This experiment was first of all carried out and demonstrated by our teacher during a lesson one morning. ...read more.

Conclusion

Place the conical flask on the cross and immediately start the stopwatch. 6. Record the time it takes for the cross to disappear on the results table. 7. Repeat steps 1-7 for each temperature, three times so that an average can be taken. Fair testing In order to make this experiment a fair test, the following dependant variables will be kept constant: - ==> Same volumes of liquids will be used each time. ==> The same concentrations of both the sodium thiosulphate and hydrochloric acid for the duration of the experiment. ==> The same concentrations of both the sodium thiosulphate and hydrochloric acid for the duration of the experiment. The independent variable is temperature. ==> Repeat the experiment 3 times to improve accuracy and validity my results. ==> Clean equipment with water between each trial. ==> Will carry out preliminary work to ensure that the practical works and that the concentrations selected are appropriate for the activity. ...read more.

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