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I am investigating the rate of reaction between hydrochloric acid and sodium thiosulphate. The variable I am going to change will be the temperature; I will raise the temperature by approximately 10oc each time.

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Introduction

I am investigating the rate of reaction between hydrochloric acid and sodium thiosulphate. The variable I am going to change will be the temperature; I will raise the temperature by approximately 10oc each time. Other possible variables that could be changed are; changing the concentration of the acid, increasing the pressure by reducing the volume of the container which means the particles will be closer together which would result in faster collisions. Using a catalyst would speed up a reaction and changing the surface area could speed up or slow down the reaction. When the two chemicals are added together, they start to react. It will give off sulphur as one of the products. This is called a precipitation reaction. The equation between sodium thiosulphate and hydrochloric acid is: Na2 S2 O3(aq) + 2HCl(aq) 2NaCl(aq) + S(s) + SO2(g) A chemical reaction can only occur between particles when they collide. The faster the particles are moving, the more energy they have. ...read more.

Middle

If I had a second set of results, my evidence may be more reliable Apparatus 2 measuring cylinders 1 small beaker of sodium thiosulphate 1 bottle of hydrochloric acid 2 teat pipettes 1 conical flask Goggles Bunsen Tripod Thermometer Stop clock Paper with cross on it To ensure that it is a fair test, the only variable that is going to be changed will be the temperature, I will try to raise it by approximately 10oC each time and I will repeat the experiment to check that I don't have any incorrect results. I will use the same bottles of acids and keep them at the same concentrations. I won't change the surface area of the chemicals. I will check there is no contamination on the equipment that could affect my results and I will use separate pipettes so that the chemicals don't start reacting before the stop clock is started. Method Collect apparatus and using the teat pipettes, pour out into measuring cylinders, 25cm3 of Sodium Thiosulphate and 25cm3 of Hydrochloric acid. ...read more.

Conclusion

The rate of reaction graph shows that the higher the temperature is the faster the rate of reaction is. If the temperature is low then the rate is slow. My predictions matched my results; this is because I had previously learnt about and researched rates of reaction. I expected to get some anomalous results because when I did the experiment in class I had anomalous results. Evaluation My results weren't 100% accurate because although I did repeat them to check that they weren't way out of proportion, I didn't record the second set of results. I had a bit of trouble reaching the correct temperature when heating up the hydrochloric acid so the temperature wasn't raised by exactly 10oC each time. Too improve my practical I would repeat the results one more time and raise the temperature more accurately. I would also try out different temperatures, for example I could lower the temperature below room temp, or I could find out if there is an optimum temperature for the rate of reaction. Clare Apps Year 11 assessed practical ...read more.

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