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In this experiment we are investigating the effect of concentration on the current flowing through a copper sulpahte solution.

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In this experiment we are investigating the effect of concentration on the current flowing through a copper sulpahte solution.


I think that the higher the concentration the higher the current passing through the solution, I also think that the higher the voltage, the higher the current. I think this will happen because there will be more copper sulphate molecules. Since there are more copper sulphate molecules, then there will be more sulphate ions giving up electrons to the anode (positive electrode) and more copper ions receiving electrons from the cathode, this means that there will be more electrons being transferred and so a higher current. The ions will break their ionic bonds because the copper plates are given a larger positive and negative charge by the battery (the circuit) and so the small force holding the ions together will be overpowered by the larger force of the electrodes on the ions. The liquid medium allows the ions to move freely and is what allows all of this to happen (The molecules in a liquid are more spaced out than in a solid (molecules in a solid bunched close together, with only enough room and energy to vibrate) and so this gives the ions the space and ability to move around and to actually get to the electrodes).

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  1. Turn the transformer to 2V and then switch on the current making sure the circuit is set up as shown.
  1. Take down the Amps and Volts from the equipment, into a results table like that below.
  1. Turn off the current and then repeat again with the current set to 4V and so on until you reach the maximum of 12V. You should have 5 results for this concentration.
  1. Repeat this experiment again with the same equipment etc to get something to compare to and to get an average from.
  1. Put another 1g of copper sulphate into the solution, to make 2g and then repeat the previous steps, getting five results and then repeating the experiment to get another five results that should be similar.
  1. Do the same with another 1g making it 3g of copper sulphate.
  1. Continue with this pattern until 5g of copper sulphate has been added in total and has been tested and retested with a total of 10 results.




Having drawn a graph from the results I obtained from the experiment, I can see that I have proven my prediction by the fact that as the concentration increases (when I add 1g of copper sulphate to the solution) the current goes up(this can be seen

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        There were obviously things that were ever so slightly off in our experiment, these things could have occurred for a number of reasons:


∙ The scaling of the equipment (we took our measurements to 2 decimal places) meant that the measurement could have been 0.005 either way of what was written. This could lead to 2 readings of 0.04 when there should have been 0.35 and 0.44.

Human Error

∙Measurement of Copper Sulphate- This could obviously effect the experiment but I believe we measured our copper sulphate with a good degree of accuracy.

∙Solution- The copper sulphate could not have fully dissolved(we may have not stirred it enough). This could mean that the amount of copper sulphate effecting the experiment was reduced and so the results could be made inaccurate.

These are the only mistakes or inaccuracies really that could have had an effect on OUR experiment, due to the fact that other factors were closely watched and did and could not have happened.

Future Experiments

A follow on experiment to do after this experiment could be to try a different ionic compound and see if it works in the same way. Perhaps the solution would only work with an electrode made from one of the compounds elements, or maybe it would not matter and the solution would change. I believe this experiment would be very interesting.

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