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Effect of increasing charge on Mass of Copper Deposited.

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Chemistry Coursework Effect of increasing charge on Mass of Copper Deposited Diagram Method * I will fist weigh the cathode * I will then set up the apparatus as shown in the diagram * Then switch the power pack on * I will wait 10 minutes and then weigh the cathode, I will do this for 50 minutes every 10 minutes My Independent Variable is the Charge My Dependent Variable is the Mass of the cathode The controlled variables are the concentration of Copper sulphate and the temperature Prediction: I can predict that there will be a positive coloration between the increase of charge and the amount of copper produced at the cathode. Scientific Explanation: Current is the flow of electrons in a circuit - in the case of electrolysis the flow is towards the cathode and away from the anode. Within the solution, the current flows because of the presence of negative and positive ions. Copper sulphate is an ionic salt, which contains no free electrons. However, it does contain ions (which are charged particles) ...read more.


So 2F is required 2 deposit 1 mole of copper (64g). Plan: Apparatus: * 2 copper electrodes - To collect the pure copper from the cathode and provide more copper in the solution. * DC Power supply - To produce a current to pass through the solution * Ammeter - to measure the current and make sure it is at the right value * Beaker - contain solution and insulate it * Wires - connect the electrodes to the power supply * Stopwatch - to time the experiment * Scales - to weigh the cathode * Propanone - to wash the cathode and remove excess solution Measurements: I am going to measure, by weighing the copper cathode before and after each change in charge. I will weigh the cathode to the nearest 100th of a gram to give me accurate results on which to base my conclusion. I would expect the weight of the cathode to increase with increased current. The change in mass of copper indicates reaction rate so that the more copper deposited at the cathode, the faster the reaction rate. ...read more.


Therefor my results support my prediction. With my scientific explanation and information I can make a table that shows the results that Faraday would have obtained from his laws. Observing my results and Faraday's results, they are not exactly the same but are very similar and both show the directly proportional relationship. Therefore my experiment can support Faraday's findings. Results of Faraday's Law Charge Mass of Copper Deposited 300 0.099 600 0.199 900 0.298 1200 0.398 1500 0.497 Evaluation: I believe that my experiment was very successful and was easily carried out. There were no outstanding anomalies, however if I repeated this experiment again I would use new electrodes and clean them more efficiently with distilled water and wire wool aswel as propanone. Which would give me a more accurate measure of the cathode mass. Also as the experiment was took out in a lesson, time was limited therefor I would connect the electrodes for a longer period of time to the circuit so the charge would be increased therefor the amount of copper deposited would increase giving me more accurate results. Also I would weigh both electrodes to observe how much weight the anode loses, and see if the loss of weight would be proportional to the charge. James Kuspisz ...read more.

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Response to the question

The experiment is laid out very well. The candidate shows deep analysis of and focus on the question which leads to a well thought out experiment. A graph to display their results would have been a different format to ...

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Response to the question

The experiment is laid out very well. The candidate shows deep analysis of and focus on the question which leads to a well thought out experiment. A graph to display their results would have been a different format to display and interpret results from. The candidate could have gone into greater depth about other factors which may have affected the experiment and have accounted for them to increase their level.

Level of analysis

The diagram is easy to read and clearly set out. The candidate does not state what effect changing other variables will have on the experiment or why they have kept the variables constant which would have showed deeper understanding of the principles behind the experiment. The prediction and scientific background to it is done very well with good scientific depth and understanding showed. The apparatus is explained clearly with function so anyone reading could repeat the experiment themselves. Decimal places are inconsistent in the table and they should be kept consistent in order to make their calculations later more accurate. Their improvements and analysis of results is also done very well.

Quality of writing

The method is used with 'I' and should be non-personal to appear more professional in scientific manner. Otherwise, spelling, grammar and punctuation are good throughout. The layout of the piece is done well with clear well define subheadings.

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