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What Affects The Rate of Electrolysis Of Copper Chloride Solution?

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Introduction

What Affects The Rate of Electrolysis Of Copper Chloride Solution? Introduction We are going to find out what things affect the rate of Electrolysis and to find this out we will use Copper chloride salt dissolved in water to form a solution. The salt is dissolved in water because chemical compounds when in a molten state or when dissolved in water exist in the form of ions that are capable of movement, meaning their molecules become dissociated into positively and negatively charged components, which have the property of conducting an electric current. A compound that conducts when molten or in solution is called an electrolyte. When some substances dissolve they change slightly, their atoms are no longer neutral, neither positive nor negative. The negative atoms lose their electrons so the atoms become positive. These particles are no longer known as atoms but ions. The positive ions are called anode. The negative ions are called cathode. These electrons only dissolve in water. Because they have enough room to move this then lets the reaction take place. Equation CuCl2 Cu+2 + 2Cl-1 If a pair of electrodes is placed in a solution and a source of direct current is connected between them, the positive ions in the solution move towards the negative electrode (cathode), and the negative ions move towards the positive electrode (anode). ...read more.

Middle

* Copper chloride solution - for doing the electrolysis experiment. What results I will collect: I will fill the beaker with copper chloride solution and set out the experiment while my partner will go and record the weight of the electrode. Then we will do the experiment and wait for 3 minutes and when the reaction is finished after 3 minutes we will go and weigh the electrode. Afterwards we will record the result. To find out how much copper is made we will subtract the weight of the electrode before the experiment from the weight of the electrode after reaction. I will alter the current every time I do the experiment because then not also can I find out how much copper is formed but also how much because I think that if there is less current, then there will be less copper formed and I want to prove my hypothesis and so if I vary the current I will found out and then prove my predictions. I will keep the same amount of solution and the same amount of concentration because if I did not it will not be a fair trial. This is because if I don't keep the same amount then the one with more solution will form more copper and the one with less solution that one will form less copper. ...read more.

Conclusion

We will use 50 ml of copper chloride solution on every trial experiment we do. Results A table to show the results collected. Amount of current Weight of electrode before reaction Weight of electrode after reaction Amount of copper made Averages 12 volts 12 volts 2.98g 3.05g 3.06g 3.10g 0.06g 0.05g 0.065g 9 volts 9 volts 3.05g 3.06g 3.07g 3.09g 0.02g 0.03g 0.25g 6 volts 6 volts 3.04g 3.04g 3.05g 3.06g 0.01g 0.02g 0.015g Conclusion I have learnt that the more electrons flowing the more chance you have of seeing a better reaction taking place, the more current flowing the quicker and better the reaction and the more concentrated the solution the more electrons will be in the beaker instead of water and the better reaction you will get. If we have a high current then there was more copper formed and more chlorine gas let off in 30 seconds. If we have a low current then there is less copper formed and less chlorine gas let off. Here is a diagram of what actually happened Evaluation: My results were reliable and I had enough results to reach to a conclusion. I had some unexpected results on the weight of the electrode before the reaction because we measured the same electrode and there weight was different. If I had more time then I would have changed the solution to a less diluted one. Overall I carried out a fair trial. Davinder Singh Poonia ...read more.

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