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

    is that copper deposits may have fallen off the electrode at various times: as it was being removed from the electrolyte, as it was being rinsed by distilled water, as it was being dried in acetone or just when being moved.

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

    origin is a line of best fit and does not go through all the points. This anomalous result was acquired when calculating the average gain in mass of the copper cathode using the current 0.8A. An average mass of 0.29g of copper was calculated.

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

    * the time each test is left for. This must be kept constant because, if the time is altered, the copper will have more/less time to decompose and discharge at the cathode and this will produce unreliable and inaccurate results. My measurements will be significantly accurate and precise as I am using accurate apparatus to conduct my experiments.

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

    I predicted the mass that was to be gained went up in 0.02g steps after every two minutes and it matched from 2 - 10 minutes however the first result didn't match because it went up by 0.03g instead of 0.02g.

  1. Investigating the factors that affect the amount of copper deposited during the electrolysis of ...

    In my plan I predicted that if I doubled the current, the amount of copper deposited at the cathode would also double. The results support this to some extent but not as accurately as hoped. At 0.2amps, there were 0.017g of Cu deposited.

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

    Sir Humphry Davy also employed him as an assistant in his chemical laboratory at the Royal Institution. He was also appointed as the director of the laboratory of the Royal Institution. In 1833 Faraday, succeeded Sir Humphry Davy and became the professor of Chemistry at the Institution.

  1. Quantitative electrolysis concerns the amount of product obtained in an electrolysis, and the various ...

    If it doesn't possess this amount of energy it will not react. It is only with Activation Energy (Ea) or higher that the molecule will react. The rate of reaction is therefore obviously dependent on the number of activated molecules present.

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

    So I decided to not use 0.1A as one of my readings but start at 0.2A which proved to have a more noticeable change and therefore would tell me more about how current affects the electrolysis of CuSO4. I also decided to leave the solutions to be electrolysed for 10

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