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The electrolysis of copper from copper sulphate solution

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Introduction

Chemistry sc1 – the electrolysis of copper from copper sulphate solution

Plan:

        The experiment that I have carried out is to find out how different concentrations of copper sulphate affect the electrolysis of copper.  To measure the affect that the different copper sulphate solution concentrations have on the electrolysis of copper, I will use current as my unit of measurement to see how the experiment was affected.  From the results that I have found, I can use Faraday's Law and turn the figures into coulombs.

  I predict that when the concentration of the copper sulphate solution is increased, then the current will also increase.  The reason for this follows a well-known theory, the collision theory.  The theory tells us that with more particles involved (in this case the higher concentration containing more particles) the more energy you will have.  The reason is simple; more particles mean more collision between them, which therefore produces more energy.  This then means that there would probably be a higher current because you have more electrons in a more concentrated solution producing more energy, and so the current is then made higher.

  I could carry out the experiment in two ways; the first would be to measure the change of mass of the copper.  However, this method is very difficult to carry out, the reason for this is, you need to take into account the original mass of the electrodes, and you need to be very accurate on knowing if ALL

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Middle

I must make sure not to run to get anything or to hurry to wash off any solution, he risks of any more accidents are to great in this situation and therefore I must carefully walk to the nearest tap to wash off the solution.If I spill any solution on someone else then I will be sure to advise them to wash off the spill with water through the same process that I would take. I must remember to wipe off any spill which land on the workplace so that there is no risk of it coming in contact with anyone else.  I must make sure that all electrical wiring is organised so that there is not loose wiring which may cause anyone to trip over, so I will have to keep a regular check on the wiring in case it poses a threat to anyone.

Results:

Concentration (Molar)

Test 1 Current (Amps)

Test 2 Current (Amps)

Test 3 Current (Amps)

1

0.55

0.55

0.48

0.8

0.29

0.29

0.34

0.6

0.23

0.22

0.24

0.4

0.13

0.17

0.11

0.2

0.08

0.09

0.10

0

0

0

0

Now I will have to work out the average current of each concentration using the simple method of working out the mean between the three tests.

  Test 1 Current + Test 2 Current + Test 3 Current = n

  n/number of tests = AVERAGE CURRENT FOR THAT CONCENTRATION

Concentration (Molar)

Average Current (Amps) (2dp)

1

0.53

0.8

0.31

0.6

0.23

0.4

0.14

0.2

0.09

0

0

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Conclusion

The way in which I obtained my different concentrations of copper sulphate solution was through mixing the two together to make the mixture.  The solution was made by measuring with the naked eye and manual hand, and pouring in the right amount of each element to balance the solution and get to the right concentration.  If the concentrations of the solutions were already made for my use with expert accuracy or if I had top scientific equipment to measure out the solution myself, then obviously the results would be more accurate and the concentrations would be fair for the current change etc.If I had extra time then I would certainly take more repeats, this would reduce the risk of any errors or anomalies and so therefore the experiment as a whole would be more trustworthy and accurate (fair).If only the temperature could be controlled I would be able to have much fairer results, because the temperature can affect the rate at which the electrolysis takes place.

This is basically what I would do if I could to make the experiment as a whole much fairer.  However, I do think that the experiment was a success and the right results were obtained.

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