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Investigate the effect of the mass of a copper anode in the electrolyte of Copper Sulphate solution.

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Introduction

Adam Pattenden 10S Investigate the effect of the mass of a copper anode in the electrolyte of Copper Sulphate solution Plan In this investigation I will be trying to find out the change in mass of a copper anode during electrolysis. I will be changing certain factors to see how these affect the mass of a copper anode. Some of the factors that will affect the mass of a copper anode are: 1) Time- If this was used as a variable/factor then I predict that the longer the time, the greater the decrease in mass of the copper anode. 2) Current- if this was used then I predict that the greater the current is, the greater the decrease in mass will be. 3) Voltage- if this was used then I predict that the greater amount of voltage would mean a greater decrease in mass of the copper anode. ...read more.

Middle

Apparatus Measuring cylinder 250 ml beaker beaker 75 ml of copper sulphate (concentration= 0.25 M) Power pack Electrodes (anode = copper, cathode = zinc) Stopwatch Scales Wires Crocodile clips Propanone Diagram Method 1) I will weigh the copper anode and record its mass 2) I will then set up the apparatus as shown in diagram 3) I will turn the voltage on the power pack up to 9 4) After 2 minutes I will take out the anode and dip it in Propanone. This evaporates any of the copper sulphate on the copper so that it does not affect the mass. Then I will weigh the anode and record the results. 5) I will repeat these steps and weigh the anode after every 2 minutes up to 20 minutes and record the results. Results Time (m) Loss of mass of the anode (g) 0 0 2 0.01 4 0.01 6 0.02 8 0.03 10 0.04 12 0.05 14 0.06 16 0.07 18 0.08 20 0.09 Conclusion The results have told me that as time increases the mass of the copper anode decreases. ...read more.

Conclusion

I thought that we did take a sufficient amount of results us maybe a few more would have given us a clearer graph and a slightly better conclusion. Our range of results was good because we did from 0 minutes to 20 minutes taking a sample every 2 minutes. We could not have taken results from over 20 minutes because we did not have enough time. We did get an anomalous result; this was taken at 2 minutes. It was anomalous because the scales that we used to weigh the anode were inaccurate so I used different scales for the rest of the experiment. If I were to do this experiment again I would have repeated the whole experiment with a different anode and cathode to see if the graph was the same and that the results were similar. This would have given me harder evidence to write my conclusion with. Other factors I would like to have investigated were the concentration of the copper sulphate and also the volume of the copper sulphate. ...read more.

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