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

Investigate whether changing voltage will affect the rate of Electrolysis.

Extracts from this document...


Electrolysis Coursework Aim; To investigate whether changing voltage will affect the rate of Electrolysis. Prediction; I predict that by increasing the voltage the rate of Electrolysis increase therefore producing a straight line graph. Hypothesis; In relation to my prediction, voltage is the force that pushes the electrical currents around. The flow of electrons around a circuit is the current. If I increase the voltage, this will provide a further push for the electrons to move more freely. The Electrolyte we used for this investigation was Copper Sulphate. For there to be more Copper Sulphate dissolved, I will have to double the voltage, this means double the push of electrons. At the negative Cathode, impure copper is forced, this is due to the fact that copper has a 2+ charge, and it will move to a negative electrode, in this case the negative Cathode. When the copper Ions are attracted by the Cathode they are called Cations, but in this case the sulphate from the Copper Sulphate solution will not be attracted to the Anode electrode. ...read more.


Preliminary Test Before proceeding with the experiment itself, I conducted a preliminary test. This was so I could ensure my variables which were; Amount of Copper Sulphate Voltage Time Length of Graphite With the CuSO , I first poured in 150mm into a glass beaker. Later I found this to be insufficient. My group and I found out that the amount of Copper Sulphate was to our surprise also insufficient, this was due to the fact that the graphite rod was not far deep enough in the CuSO solution meaning not enough of the rod was covered to bring about a good reaction. I changed the amount of Copper Sulphate to 200mm, this proved to be satisfactory. We began the preliminary test with 1 volt again this wasn't enough to produce a reaction between the graphite rod and the Copper Sulphate. I decided to start at 2 volts and timed for 5 minutes. ...read more.


At 9 volts the average for the expected amount of copper should have been 1.02. For reasons why these errors occurred I looked at some factors. The first factor I looked at was a possibility that the length of the graphite rods might have affected the outcome of the results at the two volts suggesting that the graphite rods were not deep enough in the Electrolyte. Other factors I considered was there might have been a decrease in the concentration of the solution or inaccurate timing. If any improvements were to be made, I would say, there needs to be an improvement in the efficiency in the equipment provided by the school as I remember some of our power packs not working. During the course of or experiment there seemed to be a shortage or our Electrolyte Copper Sulphate and the accuracy of the balances were poor. To take the experiment further, in relation to Electrolysis, I could look at the temperature, trying to purify copper or by using current to find out the amount of copper gains and looses in the electrodes. ...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 how the rate of electrolysis is affected when changing the current in the ...

    that the amount of electricity we pass in this circuit will directly affect the rate of electrolysis. When the circuit has electricity passing through it, the ions are floating towards the electrode. When the electricity is higher, the flow of ions is faster; therefore the ions will travel to the respective electrode faster, increasing the rate of electrolysis.

  2. Investigate whether voltage affects the rate of electrolysis?

    Goggles must always be worn to protect your eyes whilst using copper sulphate and whilst using any liquids. You should be careful also whilst handling wires and electricity. Accuracy and reliability: In my experiment I am doing a number of things to make my experiment as accurate and reliable as it can be.

  1. How does concentration affect the rate of electrolysis of Copper Sulphate solution?

    For each experiment, the Copper Sulphate Solution will be reduced by 0.2ml and the water increased by 0.2ml to keep the change in concentration consistent. After each recording the 7.5cm electrodes will be cleaned in concentrated nitric acid to remove the copper, and then doused in water to remove the nitric acid.

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

    The reason I chose the copper electrodes are that I wanted to keep the concentration of copper the same. If I had used carbon electrodes, then I would see the cathode gaining the copper ions from the solution and I would see no change in weight at the anode because

  1. An investigation to find out what factors affect the rate of electrolysis of a ...

    Therefore, everything else that is used during the experiment must remain the same. These things are, , the resistance in the circuit, the surface area of the two electrodes, and the time that the solution is electrolysed for. Most of these things can be monitored fairly easily.

  2. What Effects the Reaction in the Electrolysis of Copper Sulphate.

    Using Faraday's equations I can predict results for all my planned experiments and later compare these to my actual results. My predicted results are as follows: Amount of Coulombs Change in weight accurate to 2d.p (the cathode should gain this amount and the anode should lose this amount)

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

    2.51 0.15 1.0 1.57 1.39 -0.18 2.51 2.70 0.19 1.0 2.34 2.15 -0.19 1.97 2.16 0.19 1.0 2.15 1.97 -0.18 2.16 2.38 0.20 1.0 1.97 1.77 -0.20 2.36 2.58 0.22 (the minus sign indicates a decrease in mass) Here are the averages of my experiment: Current (amps) Anode Before (grams)

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