• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9

My aim of this experiment is to find out if the number of coulombs affects the amount of copper produced.

Extracts from this document...

Introduction

I am doing an experiment on electrolysis with copper sulphate and this is what I am planning to do. AIM: My aim of this experiment is to find out if the number of coulombs affects the amount of copper produced. HYPOTHESIS: I think that the copper will be deposited at the negative cathode as the copper ions have a positive charge, so it gets attracted by the negative cathode. The sulphate, as it has a negative ion, it will be attracted by the positive anode, but as it is not a halogen, oxygen will be given off (this is one of the many rules we have learnt about electrolysis). METHOD: I am going to set up the apparatus (as shown in the diagram on page ). I will sand the copper electrodes first, and then dip them into the copper sulphate. We will use 250ml of copper sulphate solution at 1 mole concentration. ...read more.

Middle

Broken glass. 3 2 6 Make sure that you do not knock over anything and that when there is broken glass DON'T touch it. You could knock over someone's experiment. 3 2 6 Make sure that you or anyone else is not running in the laboratory. Could accidentally get copper sulphate solution on your hands and eat it. 3 3 9 Wash your hands with soap after the experiment. VARIABLES: In this experiment I am going to vary the time we keep the experiment going as the longer we keep the experiment going the higher the number of coulombs there will be. I am going to change the amount of coulombs used in the experiment by keeping each part of the experiment going for longer. TO MAKE THIS EXPERIMENT A FAIR TEST: To make this experiment a fair test I am going to weigh the copper electrodes each time I sand it and I will use the same electrodes throughout the experiment. ...read more.

Conclusion

Therefore the cathode will gain weight and the anode will loose weight. If our experiment is successful I expect my graph to look like this: A diagram of the circuit will look like this: Here the electron flow is kept going through the circuit for every two electrons taken from the cathode a copper ion, two electrons are set free at the anode by two oxygen ions. Technically the electrons freed at the anode flow through the circuit to the cathode, because metal ions are ALWAYS positive they move to the negative cathode and get deposited. Non-metal ions are ALWAYS negative (except for hydrogen) therefore moves to the positive anode and gets discharged. The copper is collected at the cathode: 2+ - 2Cu + 4e Cu and Oxygen is released at the anode because sulphate cannot be deposited and it is not a halogen: 2- - 2O - 4e O2 The anode will decompose slightly so the mass lost, will be slightly higher than the mass gained on the cathode. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Changing Materials - The Earth and its Atmosphere section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Changing Materials - The Earth and its Atmosphere essays

  1. Investigate the factors that affect the mass of Copper deposited on the Copper Cathode ...

    Evaluation I was satisfied my experiment was reasonably successful. At the end I had acquired a set of results, which fitted my prediction quite well, not only the theoretical values but also the qualitative prediction. As I stated in my analysis one of my results was inconsistent with my prediction, it was an anomalous result.

  2. The Electrolysis Of Copper (ii) Sulphate Solution Using Copper Electrodes

    The mass change of the plates in the experiment involving 0.60A being passed through the electrolyte the results were surprisingly far from the calculated results at that amperage. The calculations above show that, in terms of percentage difference these results are the worst: 4.52% off from the calculated change in mass; nearly double the average percentage error of the experiment.

  1. Investigation to show how the amount of electric current affects the amount of copper ...

    This will make my results inaccurate and unreliable, preventing me from drawing a valid conclusion. * the size of the electrodes throughout the experiment. This will be kept constant because if they had larger or smaller surface areas, it would affect the space available for either copper to discharge and

  2. Factors affecting mass of copper transferred in Electrolysis of aqueous copper sulphate

    60C shows that the results were slightly abnormal and we can see clearly it isn't proportional whereas a line of best fit would have been harder to look out. My results did turn out the way I thought they would and matched my prediction.

  1. In this coursework, I aim to find out the different properties of gold and ...

    Instead, I could have increased the range of alloys I analysed and seen whether the patterns I have found carry on; this would have made my investigation even more accurate and reliable. Pros and Cons of Alloying Gold Alloying gold has a number of advantages; firstly, pure gold is very expensive, whereas alloyed gold proves to be much cheaper.

  2. Investigating one of the factors that affects the mass of copper deposited when copper ...

    of oxygen forming at the anode which would usually happen if using carbon or platinum electrodes, the anode 'dissolves' because each copper atom making up the electrode is giving up two of its electrons to the positive anode which forms copper ions.

  1. Investigating how the amount of copper affects the mass of the cathode

    BACKGROUND INFORMATION: British scientist, Michael Faraday (1791-1867) is best known for his finding of electromagnet induction and of the laws of electrolysis. Faraday was a son of a blacksmith and was not educated much. Soon he began to read books on electricity and was very interested in electricity.

  2. Test whether the length of time affects the amount of copper deposited on a ...

    * After the experiment I will make sure that my hands are washed and clear of any copper sulphate that might have made contact with my hands whilst drying the cathode electrode. Scientific knowledge Electrolysis is a process of splitting a compound by passing electric current through it.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work