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# An Investigation into Electrolysis - Copper Sulphate.

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Introduction

An Investigation into Electrolysis - Copper Sulphate Introduction Decomposition caused by electricity is called electrolysis. The electrical energy causes a chemical change. When a salt is dissolved in water, its ions become free to move so the solution can be "electrolyzed." The products of the electrolysis depend on the chemical solution, its strength and the type of electrode. The cathode is negatively charged and therefore attracts to it positive ions. E.g. hydrogen. The more reactive substance stays in the solution whereas the less reactive is released and appears as a gas (hydrogen) or a coating of metal. At the anode (positively charged) the negative charges are given up; for example chlorine or oxygen ions become elements. Electrolysis is used to produce gases or purify metals. PLAN Aim: To find out if the current being transferred through copper sulphate affects the amount of copper transferred. Prediction: I predict that as the amount of electrical current is passed through the copper sulphate solution more copper will be transferred. I also predict that the rise in electrical current and the rise in copper transferred will be related, and follow a trend. e.g. I believe that as the current doubles so will the amount of copper transferred. E.g. ...read more.

Middle

* Weigh the anodes original weight and make note of this. * Clip the copper plates to the sides of the beaker, making sure they are in the copper sulphate solution. * Connect the power pack and ammeter to the copper plates, creating a circuit. * Adjust the ammeter to display the correct readings. * Switch on the power pack and adjust the current. * Leave the current to pass through the copper sulphate for 5 minutes and weight the anode, again making note of this. * Repeat the last stage. Safety: Copper sulphate is an irritant so I will be careful not to get it on my hands or eyes. Goggles will be worn to prevent it going in my eyes. Fair test: In order to carry out a fair test, the only variable to be changed will be the current (amount of electricity) passing through the copper sulphate solution. The experiment carried out aimed to monitor the quantity of Copper (Cu) metal deposited during the electrolysis of Copper Sulphate solution (CuSo4) using Copper electrodes, when certain variables were changed. It was considered that the following factors could affect the deposition of Copper metal on the cathode. 1. Time 2. Current 3. Temperature 4. ...read more.

Conclusion

It has also been discovered that the copper anode releases copper ions and electrons, which form copper at the cathode. Evaluation Although this was a successful experiment, there were some factors of the experiment, which could have been improved to make it even more successful. One of these factors could have been the electrodes, which, even after a good clean were still quite dirty and obviously still had irremovable substances from previous experiments still attached to them. If this experiment were to be repeated for a second time, in need of greater accuracy, it would be imperative to have a new pair of electrodes, which have never been used before. Another factor which may have affected the overall outcome of the investigation may have been the fact that the practical work of the investigation was carried over from lesson to lesson, meaning that variables such as the concentration or the amount of the Copper Sulphate solution could have changed between lessons. To overcome this problem, a stock solution of Copper Sulphate should have been made so as the concentration remained the same at all times. The same electrodes and equipment should have been used throughout. Also, when weighing, the same electrical balance should have been used as there may have been slight differences between the two balances. This is what could explain the anomaly in the graph. ...read more.

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# Related GCSE Changing Materials - The Earth and its Atmosphere essays

1. ## An investigation to see how voltage affects The electrolysis in a copper Sulphate solution ...

4 star(s)

Evaluation I believe that the procedure was done very carelessly as the drying process before weighing needed to be done quickly as we were limited for time so it was done quickly and carelessly causing bits of copper to fall off the cathode sometimes.

2. ## To find out how current affects the rate of electrolysis

3 star(s)

Turn on the power pack 7. Time until two minutes 8. Weigh cathode make sure you do not scrape off any copper 9. Repeat three times 10. Repeat for each current Observation: Observations made during the experiment: * You could see fizzing and bubbles coming off the anode.

1. ## How does concentration affect the rate of electrolysis of Copper Sulphate solution?

- The electrodes were 4.6cm apart and were 6.8cm of the electrodes was held in the solution. Both pairs of electrodes used in the experiment were the same. - The electrodes weighed 23.25g before the experiment. As they were made from graphite they did not lose any mass during the experiment and therefore weighed the same at all times.

2. ## Investigate the factors that affect the mass of Copper deposited on the Copper Cathode ...

In the experiment the following occurred. Using the current 0.2A, an average mass of 0.085g of copper was deposited on the cathode, which meant the cathode gained in mass. The copper ions gained electrons (reduction) and formed atoms and left the solution. At the anode copper atoms lost electrons (oxidation)

1. ## Factors affecting mass of copper transferred in Electrolysis of aqueous copper sulphate

It made my plan better and to do it I followed the same method as below. Method 1. Collect equipment and set it up as shown in the diagram above. 2. Weigh both the anode and cathode and the anode and record the result.

2. ## What Effects the Reaction in the Electrolysis of Copper Sulphate.

An ion which carries a positive charge is called a cation and an ion which carries a negative charge is called an anion. In my experiment the copper will become a cation before it gains 2 electrons to become a naturally charged atom.

1. ## The Electrolysis Of Copper (ii) Sulphate Solution Using Copper Electrodes

electrodes (effective collisions are those where the ions possess activation energy or above for the reaction on collision with the electrodes). Increasing current intensity or voltage Increasing the current or voltage causes the ions to move through the electrolyte faster which increases the frequency of effective collisions.

2. ## Investigation to show how the amount of electric current affects the amount of copper ...

be deposited in the case of the cathode, or for copper to be released into the electrolyte in the case of the anode. As well as using the same electrodes, this also means that they must be submerged into the copper sulphate solution equally at each individual test.

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