• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

An Investigation Into the Electrolysis Of Copper Sulphate Solution

Extracts from this document...


An Investigation Into the Electrolysis Of Copper Sulphate Solution Skill Area P (Planning Experimental Procedures) During the work topic 'Electrochemistry,' a procedure was demonstrated in which copper sulphate solution was electrolysed. Using copper-foil electrodes, a current of 0.2A was passed through a circuit, and into the solution. After 20 minutes, it seemed that not a lot had happened, however, when at the end of this time we re-weighed the anode (positive electrode) and the cathode (negative electrode), it was discovered that the anode had lost some of it's initial mass, and the cathode had gained in mass. The loss of anode mass equalled the gain of mass on the cathode. This makes it known that by passing a constant electric current through an aqueous copper sulphate solution that the passage of ions through this solution results in copper atoms being dissolved into the solution from the anode while positive copper ions (cations) being discharged at the cathode. Normally anions are discharged at the anode. The splitting of the copper sulphate solution into its constituent elements, copper and sulphur, by electricity is known as electrolysis and the copper gained on the cathode is known as the electrolyte. From this, it would seem logical to assume that the greater the amount of electricity, the greater the amount of copper that will move from the anode to the cathode. ...read more.


The apparatus I shall use is labelled overleaf: During my experiment, it was considered that the following factors could affect the deposition of Copper metal on the cathode. 1. Time 2. Current 3. Temperature 4. Molarity/Concentration of Solution 5. Quantity of Solution 6. Size of Electrodes 7. Distance between the electrodes 8. The surface of the electrodes I must strive to try to keep these variables from affecting my results. One way is to thoroughly clean all equipment after each use. A good range and number of electrical charges to use could be achieved by having times of 5 minutes of the current flowing, and currents ranging from 0.2A to 1A. Here is a table to show how I will carry out the investigation: Current / Amperes Time / Seconds Electrical Charge /Coulombs 0.2 300 (5mins) 60 0.4 300 (5mins) 120 0.6 300 (5mins) 180 0.8 300 (5mins) 240 1.0 300 (5mins) 300 Whilst studying 'Electrochemistry,' it was realised that: '1 mole of electrons is equal to a 96,500 C electrical charge.' The figure of 96,500 C is referred to now as a faraday (F), which was named after a scientist, Michael Faraday (1791-1867), who researched the topic in its primary stages. Using this evidence, we can now predict how much copper will be formed for the given currents above. ...read more.


Complete drying process with hair dryer. 6) Weigh the electrodes to see how much copper has been formed and lost at the cathode and anode respectively; 7) Set up the apparatus again, using new copper sulphate solution, that is the same amount as before (probably about 200-300cm� depending on resources available) and repeat stages 1) to 6), but this time, increase the current to 0.4A for the electrolysis; 8) During this next electrolysis, plot the data obtained (using Charge (C) = Current (A) x Time (sec.) to give the electrical charge on the horizontal axis, and plot mass of copper deposited on the vertical axis. As the investigation progresses, it will then be able to be seen if any anomalous results are encountered, and if so if I will need to repeat them whilst the apparatus is still set up; 9) Repeat 7) and 8) for currents of 0.6A, 0.8A, and 1Amp. Review Of Skill P Having had the opportunity to read over my documents for the final time before undertaking the experiment, I have decided to make one slight change to my method. In part 7) on p6, I stated that I'd probably use 200-300cm� of copper sulphate solution. Having now been briefed fully on what equipment I shall have at my disposal, I will now use just 50 cm� of solution. Apart from this small but important change, I don't think I need to make any more change to my plan. ...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. How does concentration affect the rate of electrolysis of Copper Sulphate solution?

    initially it is steeper but then (after the anomaly that occurred at 0.8) the gradient decreases. This may have been effected through the different electrodes that were used twice in the concentrations of 0.9 and 1 (shown in tables 3 & 4)

  2. The Electrolysis Of Copper Sulphate Solution Using Copper Electrodes

    This alters the current, thus declaring the results invalid since current was expected to affect, and did affect the mass of copper deposited at cathode. The drop in the mass deposited in very low concentrations was due to the drop in current rather than the concentration itself.

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

    Propanone is extremely flammable, especially its vapour that will catch fire at temperatures above -20 c, its vapour also can cause dizziness and drowsiness. Also it is an irritant to the eyes and can degrease the skin. Copper sulphate is harmful if used internally, e.g.

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

    At the cathode the copper ions gain two electrons to become copper atoms, which is called a reduction reaction. The copper atoms will then cling to the pure copper cathode so it gets thicker. I don't think that the colour of the solution will change as the copper ions become

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

    This will be kept constant in order to ensure that electrical current levels do not increase, decrease or fluctuate from the intended current. If this is not kept constant, then more or fewer electrons will be supplied to the cathode which will mean more or less copper will be deposited.

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

    conjunction with the ionic half equation to deduce the mass of product obtained when a certain amount of charge is passed. I will use this method to verify my results. A current of Y Amps was passed for five minutes through Copper(II)

  1. Investigate the effect of the amount of sodium chloride, i.e. concentration gradient, in the ...

    I connected the beaker of sodium chloride solution with the electric current as in the plan and passed through electricity. Safety Precautions There are some safety precautions I have to beware of, or I will get myself into potential danger.

  2. Investigation into Electrolysis

    The wiped anode was weighed after the completion of the experiment and cathode cleaned of any precipitate. The experiment was completed for Copper, Nickel, Zinc and Aluminium, and their respective aqueous solutions. Results: Stage Anode Cathode Solution(s) Measurements Observations 1a.

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