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Find out whether the reaction between Sodium Thiosulphate and Hydrochloric acid stays the same, increases or decreases when the temperature for both of the components is increased.

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Introduction

Task Set: I am going to try and find out whether the reaction between Sodium Thiosulphate and Hydrochloric acid stays the same, increases or decreases when the temperature for both of the components is increased. Prediction: I predict that as the 2 components are heated the reaction will get quicker in time until a certain point. When the liquids reach a certain temperature the liquids will be too hot to make a reaction and there will be no reaction. Apparatus: for my experiment I will need: > Bench Mat > 2 Thermometers > 1 Measuring Cylinder (25cm�) > 30cm of Sodium Thiosulphate > 30cm of Hydrochloric Acid > 2 beakers > X mat > Water Bath > Ice Box with cold water > Stop watch Apparatus Set up: X ...read more.

Middle

> Then add both liquids into 1 beaker and start the timer. > Stop the clock when the X has totally disappeared and record your results. Observations: When I am carrying out this experiment I am going to be measuring how long it takes for the Hydrochloric Acid and the Sodium Thiosulphate, to cloud over a X mark which will be placed underneath a beaker. I will be measuring the time in seconds. Despite the time going into the minutes I am going to count them as seconds. This is because when I am placing the results and plotting the graph on the computer the spreadsheet program that I am using will place the results In a different way because it will count the one minute as one second and place the result as one second which would be wrong. ...read more.

Conclusion

These are the experiments at 23�C and 30�C. Evaluation: After looking at my results and graphs I can see that my experiment was not a fair test as some of the results look like they have gone wrong. So after discovering this I can virtually say that the results I have are unreliable. To make the test fairer the next time I carry it out I think that I should carry out each temperature out more than three times and instead carry them out another odd number of times like 5 or 7. This should enable me to gain better and more accurate results. Appendix: To help me out with this experiment I have used the following resources: > AQA Modular Science FINAL EXAM, Higher Level > Britannica 2001 > Lett's Science revision guide ...read more.

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