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I want to find out the affect current has on copper sulphate solutions as I increase the voltage.

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Introduction

Aim: I want to find out the affect current has on copper sulphate solutions as I increase the voltage. Prediction: I predict that as I increase the amount of current, the rate of extraction will speed up. In this case, if I start off low, the result will be minimum, whereas, as I steadily increase the current the result will change and maximise. As a result, due to this increase of current the rate of electrolysis will fasten, producing more and more copper in the negative cathode. Hypothesis: Electrolysis is a chemical reaction caused by the passing of an electric current through an electrolyte, which in my case is copper sulphate solution. In general, electrolysis is the decomposition of a compound into its element. To convey the electricity to the solution we use electrodes, where the end product is gathered. The element should on either the anode or the cathode; this basically depends on the charge of the product. The element with a positive charge, e.g. copper is a metal, which is attracted to the negative electrode (cathode) and this is where all the copper collects. The sulphate splits into sulphur ions; this has a negative charge (anode). ...read more.

Middle

at the beginning of the investigation. 4. Make sure all wires are working appropriately and all the other equipment, and then begin the experiment. 5. Start off with 2 volts and for each bear in mind to only leave it to a standard 5 minutes. After the 5 minutes weigh both electrodes separately and record the results into a table. 6. Repeat steps 5 again, only this time increase the current to 4 volts then 6 up until 12. Remember to record the outcomes into a table each time. Results: Here is what I am going to use to record my results in: Current Cathode (-) Anode (+) Time (mins) 0 5 2 5 4 5 6 5 8 5 10 5 12 5 Here are the actual results, which I obtained from the experiment: Current Cathode (-) Anode (+) Time (mins) 0 1.6 1.5 5 2 1.7 1.5 5 4 1.8 1.5 5 6 2.0 1.5 5 8 2.2 1.5 5 10 2.4 1.5 5 12 2.5 1.5 5 Graph: From my results I drew up a line graph stating my results, here it is: Conclusion: After carrying out this investigation, I have noticed that I have learnt many new things about electrolysis than I knew before. ...read more.

Conclusion

same throughout the investigation when I changed the current each time. I also made sure I had followed all rules and my method in order to obtain firm results. But I later realised that I could have dried the electrodes (anode and cathode) before weighing them, this is because water probably made the electrodes slightly heavier than it should have been. I did not have enough time to do this that is why it was left out. Finally, if I had the chance to improve my results I would have changed a few things so that my outcomes would have been extremely reliable. For example I could have got even more reliable weighing machines because the ones we used were not exact. I also could have compared 2 or 3 results and worked out the average for it, although I didn't have enough time in order to do this. Subsequently, as I have mentioned before each time I changed the current I could have changes the electrodes so that water didn't affect it as much. In general, these are the aspects of the investigation I could have improved if I did it again. I could have researched in more depth for a better conclusion and a firm investigation. What affects the rate of electrolysis? Nasir Hussain 10.8 ...read more.

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