• 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 Factors Which Effect the Electrolysis of Copper Sulphate Solution.

Extracts from this document...


An investigation into the factors which effect The electrolysis of copper sulphate solution. Task: My task is to find out how we can increase the mass of the cathode, and how different methods affect it. We know that by passing an electric current through an aqueous copper sulphate solution, that ions passing through this solution will cause anions to be dissolved into the solution from the anode, and deposited on the cathode. Diagram: Equipment needed: * 2 copper strips (anode and cathode) * 50ml Copper sulphate solution (aq) * 1 voltmeter * 1 power supply * 1 variable resistor Method: First, I shall weigh the anode and cathode, and label them. I shall then set up the experiment, as shown above, and set the current at 0.1 amps. I shall then leave it for 5 minutes for electrolysis to take place, before weighing the anode and cathode, and increasing the current to 0.2 amps, re-weighing the anode and cathode, then 0.3 amps and so on, up to 0.9 amps. I shall repeat this, but I do not feel that I shall have time to repeat it twice. ...read more.


Prediction: I predict that the relationship will be directly proportional between the amount of current flowing and the mass of the copper deposited on the cathode. Therefore, I can predict that if for instance I doubled the amount of current, I would double the amount of copper deposited. Faraday's laws can back up this statement. Faraday's first law of electrolysis is that: "The mass of any element deposited during electrolysis is directly proportional to the number of coulombs of electricity passed" Faraday's second law is that: "The mass of an element deposited by one faraday of electricity is equal to the atomic mass in grams of the element divided by the number of electrons required to discharge one ion of the element." Quantitative predictions: It is possible to get a rough idea of how the results may turn out, by using quantitative predictions, to work out the approximate mass. This can be done using a series of equations: * Charge = current x time (s) * Moles of electrons or faradays = charge / 96500 * Moles of copper = moles of electrons or faradays / ratio = 2 * Mass = moles x RAM If the current is 0.2A and the time taken is 5 minutes * Charge = 0.2 x (5x60) ...read more.


Evaluation: Although the experiment was successful, and I have obtained good enough results to form a valid conclusion, there were some factors of the experiment, which could have been improved to make the experiment even more successful. Possibly the largest factor was the electrodes, which could have had dirt on the surface, which could have slowed the electrolysis process. To improve this, it may have been necessary to clean the electrodes before use. Another factor was the way that the surface liquid was removed, which unfortunately in most cases was not entirely, which could have drastically affected the results. To solve this, a possible way may have been to wash them in water, and then to dip them in a highly volatile solution, such as propanone, which would have of rapidly evaporated if placed next to a radiator, or left to evaporate naturally. Another factor was the inaccuracy of the current, due to perhaps heat or resistances increase in the solution. Unfortunately there is no way around this problem, other than to try and maintain the current using the variable resistor. I found this experiment very interesting, and am looking forward to perhaps investigating the other variable to find how they affect the mass at the cathode. Luke Rice 1 ...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?

    the current of 1 mol/dm� is not double that of the current of 0.5 mol/dm�). The overall incline of the graph is upwards. This indicates that as the concentration increases, so does the current recorded. Through looking at the gradient of the graph (fig 2), it can be seen that

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

    the electrolyte by the anode as more electrons are being taken away from it. Similarly, if the electric current is smaller, fewer electrons are being supplied to the cathode and fewer taken from the anode. Michael Faraday was one of the first scientists to study electrolysis.

  1. The Electrolysis Of Copper Sulphate Solution Using Copper Electrodes

    cell by ionization of the the air around it remains to be seen. METHOD The apparatus was set up as in the diagram below: Copper Sulphate solution (50cm3) was poured into a small beaker. The two copper electrodes were thoroughly cleaned using water and steel wool, to scratch off the layers of copper from previous experiments.

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

    This means a range of amperages and a time period which won't cause the electrolyte to heat up too much so as to have a considerable affect on the results. Values of current were chosen for a particular amount of time that will give a reasonable mass of copper but with a minimal temperature rise.

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

    This is what one expects to happen in the electrolysis of copper(11) sulphate solution using copper cathodes, now the factor which is going to be investigated, the current will be observed. It is predicted that the current will affect the amount of copper deposited on the cathode in the following ways.

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

    c) The higher the concentration of the copper (II) sulphate solution, the more copper will be deposited on the cathode. This is because increasing the concentration increases the number of copper ions, so there are more ions to be converted into copper atoms.

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

    Each electron that goes round the circuit has a tiny charge. A current of 1 ampere flowing for 1 second carries a charge of 1 coulomb. To find the charge of any current we can use the formula: charge = current x time.

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

    This is what Faraday's second law of electrolysis is suggesting. It is also found that the discharge of one mole of atoms of an element from an ion with a single positive or negative charge requires 1 F of electricity.

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