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To investigate Electrolysis affecting amounts of substances at Anode+ and Cathode-

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Steven Pemberton Chemistry Investigation To investigate Electrolysis affecting amounts of substances at Anode+ and Cathode- Prediction I predict that the longer the electricity is passed through the Anode and Cathode the more effect it will have on them. The anode will be less in weight than the cathode due to it increasing in weight. Safety The experiment there are a few safety rules that will have to be taken into consideration. The main safety rule is that when the investigation is taking place the anode and cathode must not be touched in fear of an electric shock. When the investigation is being completed electricity must be turned off with care being careful not to touch anode and cathode together. If anode and cathode were to touch then a spark would appear and a fire may be started or some kind of serious injury may occur. Method You will need: * Measuring Cylinder (to measure the amount of ionic solution to use) * An ammeter to record and watch the amps * A 400ml beaker (for the reaction to take place in) * Stopwatch (to time the reaction) * A power pack to supply the electricity for the experiment to take place. ...read more.


To help prove and support the results that follow there is the electrolysis laws carried and found by Faraday. Here are a couple of quotes that Faraday stated to do with electrolysis. Faraday's First Law of electrolysis states that: "The mass of any element deposited during electrolysis is directly proportional to the number of coulombs of electricity passed" This means that the element left on the cathode is corresponding in size to the number of coulombs of electricity passed through the anode and cathode. Faraday's Second Law of electrolysis states that: "The mass of an element deposited by one Faraday of electricity is equal to the atomic mass in grams of the element divided by the number of electrons required to discharge one ion of the element." This means that the collection of an element gathered up by one Faraday of electricity is equivalent to the atomic mass in grams of the element divided by the number of electrons needed to absolve one ion of the element. It has also been discovered that the copper anode releases copper ions and electrons, which form copper at the cathode. At the anode (+): Cu(r) Cu2+(r) 2e- At the Cathode (-): Cu2++ 2e-(r) ...read more.


Evaluation My experiment went well with me results being quite precise. If I were going to do this experiment again I would have to consider changing and altering the equipment to get the best results possible. First of all I would make all my measurements of the chemicals accurate leaving no tolerance, using a measuring cylinder. Then I would clean the equipment to prevent there being any dirt or other chemicals present which could affect the results because the other chemicals can react and alter the resistance of the electricity. This would then give false results. To make the results accurate I will use the same stopwatch and same pieces of cooper for the anode and cathode. Then I would try to time the reactions more carefully keeping an eye on the time so that I know when to stop the reaction. Also I shall use the same electrical equipment to carry out the experiment with. Basically if I carried out the investigation again I would be cautious to make sure all the equipment was the same and that test were carried fair to give very precise results. With the equipment and my results being accurate the investigation went according to plan with no major problems. Biogeography http://www.creative-chemistry.org.uk/ http://www.gcsechemistry.com St. Cyres Comprehensive School, Chemistry Department, GCSE Course, Topic 8 The Extraction of Metals GCSE Separate Science Chemistry: the Revision Guide: Higher Level Richard Parsons (Editor) Steven Pemberton 11JRI ...read more.

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