An Investigation Into The Effect Of An Electric Current On Copper Sulphate Solution

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An Investigation Into The Effect Of An Electric Current On Copper Sulphate Solution

Aim

In this experiment my aim is to enforce and develop ideas about the investigation into the effect of an electrical current through copper sulphate solution.

Safety

- Electricity is dangerous
- Aware of coppers sharp edges
- Long hair tied back
- Use of acids in experiment

Diagram

1) Weigh the cathode

2) Set up apparatus below

3) After a minute, remove the copper and shake off the excess copper sulphate solution. Wipe the copper with acetone and waft in the air to remove as much of the solution as possible.

4) Weigh the cathode again and record results. Repeat this procedure for the other currents.

The anode does not need to be changed

Prediction

I predict that as you increase the voltage the mass of the cathode will increase. However much the cathode increases in mass the anode will increase in mass proportionately. I also think that the change in mass will be directly proportional to the charge giving a straight line that passes through the origin.

Justification Of Prediction

I think the increase of voltage will result in the increased mass of the cathode. This is because the higher the voltage, the more electrons are 'pulled' off the anode therefore more can be deposited onto the cathode resulting in a higher mass. Theoretically as you double the voltage the mass should double giving us a graph, which goes through the origin. Using the equation Cu² - 2e Cu (s) we know that 1 mole of copper ions requires 2 moles of electrons to produce 1 mole of copper metal. We can also use the equation to predict how much copper should be deposited. The formula is:

½ x I x T
---------

95600

Next I will show a results table of predicted results, based on the formulas I have given. This will be useful when I have my actual results as I can compare these to what the ideal results should be, and then evaluate whether I have valid results.

GRAPH

GRAPH

Analysis

By using the equation, 'Cu² - 2e’ Cu (s)' and the formula Q = I x T
/ 95600 we can work out how much copper should have been deposited.

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