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

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Introduction

CHEMISTRY COURSEWORK 2002 ALICE BOAGEY 10JS - MR MARTIN 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. ...read more.

Middle

THEORETICAL RESULTS TABLE Time / s Current / I Charge / c Av. Mass Deposited / g 1/2 x (IxT / 96500x64) 60 0.5 30 0.007 0.010 60 0.6 36 0.013 0.012 60 0.7 42 0.021 0.014 60 0.8 48 0.027 0.016 60 0.9 54 0.024 0.018 60 1.0 60 0.032 0.020 ACTUAL RESULTS TABLE Time / s Current / I Charge / c Av. Mass Deposited / g 1/2 x (IxT / 96500x64) 60 0.5 60 0.6 60 0.7 60 0.8 60 0.9 60 1.0 ANALYSIS By using the equation, 'Cu� - 2e� � Cu (s)' and the formula Q = I x T / 95600 we can work out how much copper should have been deposited. Once we have found out the charge (Q) we divide it by 2. This is because you have 2 moles of electrons to 1 mole of copper. This is proven by the equation ' moles = mass / R.A.M (relative atomic mass).' ...read more.

Conclusion

The results we collected were not as we had expected and in places fell quite a way from the line. I have circled the points I feel to be anomalous, and I will now explain how I perceive we found them. I think that my odd results were due to human error. It is the last two results I believe to be odd, which may explain something. I think it was the last two results that were wrong as it was towards the end of the experiment that we had less time, and therefore weren't as careful drying the copper as we could have been. To make the results more reliable I would have liked to weigh the anode each time, and compare it to the weight of the cathode to make sure if the loss was equal to the gain. I think that bigger cathodes would gain accuracy, and also making sure that the cathode and anode stayed the same distance away from each other throughout the experiment. If I could explore this experiment more thoroughly I would investigate a greater range of currents and voltages. Also different concentrations of copper sulphate solution. ...read more.

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