• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6
7. 7
7
8. 8
8
9. 9
9

# An Investigation into Electrolysis - Copper Sulphate.

Extracts from this document...

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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Changing Materials - The Earth and its Atmosphere section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

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

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

3 star(s)

In this case the hydroxide ion is discharged by loosing its electron to form water and oxygen, 4OH- - 4e- = 2O + 2H2O. * You could see the colour of the electrolyte turning pale as the copper is the substance which gives the solution the blue colour.

2. ## 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.

1. ## Thermal Decomposition Of Metal Carbonates

Measuring Cylinder 2. Bowl 3. Conical flask 4. Stopwatch 5. Carbonates 6. Weighing machine 7. Water 8. Pipe 9. 5 Test tubes 10. Clamp and stand 11. Bunsen burner 12. Heatproof mat Diagram of equipment setup: Method: > First I will set up the apparatus. > Check that all of the apparatus if working and is safe to use.

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

Also I had been given some secondary data to refer to which helped me in my planning. It helped me produce my qualitative prediction as the figures, when carefully observed showed how when the current increased so did the mass of copper deposited on the cathode, and that if you double the current you double the mass of copper deposited.

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

2 5 Temperature increase (0C) 1.00 2.25 Mass increase (g) 0.01 0.06 At both amperages the temperature increase is very small. However the increase in mass after two minutes wasn't large enough to be recorded accurately. After five minutes there was a reasonable increase in mass with little temperature rise so 0.3A was chosen as

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

I will be careful to dry my hands thoroughly after washing my electrodes to avoid any chance of shock. I am unsure of what quantities would be best to use for my experiment. If my quantities are too low then a great deal of accurate equipment will be required or

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

* the time each test is left for. This must be kept constant because, if the time is altered, the copper will have more/less time to decompose and discharge at the cathode and this will produce unreliable and inaccurate results. My measurements will be significantly accurate and precise as I am using accurate apparatus to conduct my experiments.

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

Hypothesis I think that the mass of the copper electrode at the cathode will increase because once a current is applied the copper and the sulphate ions are free to move from their ionic bonds so are attracted to the cathode.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to