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The aim of this experiment is discover the relationship between the temperature (20C,25C,30C,35C,40C) of the reaction between acidified Potassium Dichromate and Iron using a water bath

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Introduction

Chemistry Write up # 9: Design Design - Potassium Dichromate Introduction: The reaction that is carried out in this design practical is between acidified Potassium dichromate and Iron wool. The reaction is a redox reaction. A Redox reaction (a short way of saying "reduction-oxidation reaction") is the simultaneous transfer of electrons between multiple substances. The oxidation numbers or the oxidation state of atoms is changed through the process of oxidation or reduction. Reduction is where electrons are gained to the reaction and oxidation is when electrons are lost in a reaction between substances. In this experiment Iron (or Fe) is losing two electrons meaning it undergoing oxidation. Potassium Dichromate is gaining electrons meaning it is undergoing reduction. The Iron is the Reducing agent because it gave electrons to the Potassium Dichromate. The Potassium Dichromate is the oxidising agent because it took electrons from the iron. This experiment will attempt to prove the redox reaction through experimentation. Redox half equations: x3 ( Fe � Fe2+ + 2e- ) ...read more.

Middle

into cube shape 1cmx1cmx1cm Type/brand of wool Superior manufactures ltd Same box of Iron wool is used Air temperature 19.0�C �0.1�C Tests are carried out on same day Concentration of sulphuric acid 2.0 mol Same bottle is used in each test Concentration of potassium dichromate 0.1 mol Same solution is used in each test Colour Yellow- dark green A pilot with dark green colour is used to compare to the colour change in the trials How to ensure reliability of results: To ensure the reliability of results the temperature of the water bath and the reaction are measured very frequently (once a min). The chemicals came from the same containers as to keep concentration consistent. I did a pilot test first to see what colour I am looking for. This beaker of dark green liquid is then used to compare with the colours in the trials so I know when the reaction has come to completion. Equipment: 1) 5x 20ml Sulphuric acid-2.0mol 2) 5x 20ml Potassium Dichromate- 0.1mol 3) ...read more.

Conclusion

Place the iron wool in the beaker and simultaneously push the start button on the digital stop watch. The colour should change from yellow to a dark green colour. As soon as you are satisfied the colour has changed to the dark green colour push the stop button on the digital stop watch. Record this time in your pre prepared data table. 6) Next repeat steeps (2-5) 5 times with the same chemicals. These will be the five trials. 7) Repeat steps (2-6) 5 times but now change the water bath temperature. The range of temperatures are (20�C ,25�C,30�C,35�C,40�C). Record all the data in the table you have prepared. Data Table: Raw data table showing the effect of a change on temperature on the rate in which the reaction between acidified Potassium Dichromate and Iron wool occurs. Temperatures (�C) Time (seconds) Average Trial 1 Trial 2 Trail 3 Trail 4 Trial 5 20 ---- ---- ---- ---- ---- ---- 25 ---- ---- ---- ---- ---- ---- 30 ---- ---- ---- ---- ---- ---- 35 ---- ---- ---- ---- ---- ---- 40 ---- ---- ---- ---- ---- ---- Diagram: ?? ?? ?? ?? Thomas Bishop 13EVF 3/07/11 1 ...read more.

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