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Electrolysis with water

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Electrolysis with water Predictions: 1. Distance between the electrodes I predict that the current will decrease if the distance between the anode and cathode are quite far apart because the ions have further to travel and their energy will wear off. Water molecules also don't help to carry the current along instead they block up the way for the current flowing so the further the distance the harder it is for the current to flow. 2. Depth of electrode: I predict that the deeper the concentration that the electrodes are in, the faster the current will flow. I think this because when there is a shallow amount of concentration then the ions will only have a small area of the electrode to attract to, as shown in the diagram below: [image001.gif] [image002.gif] [image003.gif] [image004.gif] The red shaded part of the electrode is where the ions can be attracted to because that is the part of the electrode, which is placed in the solution. [image005.gif] The ions can only be attracted to the small area of the electrode in the solution. When the electrodes are in a deeper volume of solution, then the electrodes have a larger area where the ions can attract to as shown in the diagram below. ...read more.


The positive ions are attracted to the cathode and the negative ions are attracted to the anode. When the electrodes are places in a shallow volume of solution there is a much smaller area where the ions can be attracted to therefore, there is a weaker current flowing. The results from my graph are very accurate to my prediction because my prediction was the same as the scientific knowledge for the results of my graph. The pattern on my graph, which is a straight diagonal line, summarises all of the scientific explanation for this particular variable. The deeper the solution the stronger the current. There are a few anomalous results, which might have occurred due to being inaccurate during the practical experiment, for example: Not holding the electrodes steadily in the solution and therefore an anomalous result would have occurred. I come to the conclusion that the deeper the electrodes are in the solution, the faster the current flows and the shallower the electrodes are in the solution, the slower the current flows. Analysis of graph three: The third and final graph tested the variable: Concentration of solution. The pattern on the graph shows that the stronger the solution is, the faster the current flows and vice-versa - the weaker the solution, the slower the current flows. ...read more.


However I am still not confident about my conclusion for the variable testing: concentration of solution, because it is difficult to work out whether the graph will curve or soon level off. Therefore I will need a wider range of values. If I could do further work on this experiment I would improve the method of it by using equipment which can hold the electrodes secure for the duration of the reading. Therefore I will receive very accurate results when I repeat them. I do think though that 3 repeats is enough to get an accurate average reading so I would not increase the amount of repeat test if I was to do this experiment with more precise work. Controlling the outside condition is very difficult because I can't control the temperature of room temperature, but to make it a fair test, I would carry out the three experiments in the same room so the temperature would be roughly the same. As I have mentioned before, I will make the range of values wider to see what direction the line of best fit will continue in especially for the variable testing: concentration of solution. Overall though, I think my performance of the practical experiment was very organised and accurate which is reflected in the results I obtained. ...read more.

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