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Chemistry Coursework- Sodiumthiosulphate

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Introduction

Hayley Mitchell 27th April 10G3 Mrs Hewitt Chemistry Coursework- Sodiumthiosulphate and Hydrochloric acid experiment. Aim: To test what effect increasing the temperature of the Hydrochloric acid has on the reaction between Hydrochloric acid and Sodiumthiosulphate. Prediction: Na2S203 + 2Hcl --> S + 2NaCl + H2O + S02. I think that the higher the temperature, the faster the reaction will take place. I think this because there will be more activation energy in the particles of the two substances, which will mean that there is more chance of collision. With more collisions, the substances will react more often, and so cause the reaction rate to decrease. I think that the reaction will be almost directly proportional to the temperature. I doubt, however that if you double the temperature, the reaction rate will be double exactly. I think there will be quite a difference in the reaction rate if you double the temperature, but I I am not sure about the reaction rate halving because of this. I have done previous work on reaction rates, and have found that if you increase the temperature, the reaction rate increases. ...read more.

Middle

Concentrated acid is fuming. Its melting point is -25 C and its boiling point is 109 C. It is quite stable but you must avoid heat and flames. It is incompatible with most common metals and metal oxides. For safety you must wear safety glasses and have effective ventilation. Method: I shall heat the sodiumthiosulphate in a water bath before I begin the experiment. The water bath will help to keep the temperature constant. The sodiumthiosulphate will have to be placed into two test tubes while in the water bath to hold them properly. I will add the sodiumthiosulphate to the hydrochloric acid in a conical flask, and watch the reaction. Underneath the flask will be a cross, marked on a waterproof mat. This will help tell when the reaction is over. A solid form of sulphur is left in a solution of water, and this makes it a cloudy yellow colour. When I cannot see the cross through the solution I will know that the reaction is over. I will time the reaction with a stopwatch. Plan Scientific information Reactivity series. ...read more.

Conclusion

* Water bath - to heat the sodiumthiosulphate and keep it at a constant temperature. * Two test tubes - to put the sodiumthiosulphate in the water bath while heating. I shall be using 50ml of sodiumthiosulphate and 10ml of diluted hydrochloric acid. The hydrochloric acid will be diluted 5ml acid, 5ml water. Fair testing: To keep this a fair test I will keep these variables the same: Concentration of Sodiumthiosulphate: I will keep this the same because the higher the concentration of the Sodiumthiosulphate the more particles there will be reacting with each other, so speeding up the experiment which would affect my results. Volumes of HCl and Na2S2O3: I will keep this the same because the higher the volume of the Sodiumthiosulphate and Hydrochloric acid the more particles there will be reacting with each other, so speeding up the experiment which would affect my results. Results: Temperature (C) Time (seconds) 10 45.66 42.54 44.1 20 29.63 31.66 30.645 30 21.31 21.12 21.215 40 14.18 13.32 13.75 50 11.91 11.09 11.5 60 7.06 7.54 7.3 70 6.76 7.92 7.34 80 3.56 4.53 4.045 Graphs Conclusion Evaluation ...read more.

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