• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

How voltage and acidity affects the rate of electrolysis.

Extracts from this document...


Aim My aim is to find out how voltage and acidity affects the rate of electrolysis. Prediction To begin with, my prediction is that the increase of acid in the water, as well as making it a higher concentration, will quicken the rate of electrolysis and at the same time, take place a bigger reaction. I predict this because I know that acid has many ions and so the discharge of these ions to the negative and positive rods will break them down and cause to produce gasses. Furthermore, I also predict that the increase in voltage, besides the acidity, will similarly, quicken the rate of the reaction, this is because the movement of the ions will react quicker. Plus, what is more, I have considered that a higher temperature will increase the rate slightly. My first two effects of changing the rate of electrolysis will be experimented on again, after my first results, to make a fair test. Next to that, a third effect, likewise to the change of temperature, will only come as a second thought and will not be included in my experiment. Apparatus This is the list of equipment that I will be using in my experiment: * Mini Electrolysis cell * Power Cell * Clamp stand * Ammeter * ...read more.


I will repeat this experiment with the following different acid amounts: 4,6 and 8ml which in return will reduce the amount of water as the amount of acid gets higher to equal to 20ml. And also, I will record under the same fixed voltage along with each acid amount twice, each on a different rod- cathode and anode. Risk Assessment These points listed below are there to keep safe while experimenting and to ensure the use of the equipment again more likely. * Avoid spilling acid on skin clothes and especially eyes. * Goggles are recommended but not compulsory. * Treat the mini electrolysis cells with care as they are liable to break and come at a high cost. * Do not grip forks around the mini electrolysis cell with the clamp stand by means of too much force because it will cause the glass to crack or shatter. Control This whole experiment is to be done with control to make a fair test. To do this I am making sure that there is not an obvious change in temperature by getting the main substance, which is water, always from the same source. Once I have done one experiment at a single variable, I will use new acid and water for the next test because ...read more.


The anomalous result shows a decrease in time and so this gas formed at the top, as previously explained, had given it a sort of head start and finished earlier. My results have no major distinctive errors and so they are reliable. More precautions to improve the experiment could be taken such as: using the same concentration of acid, keeping the same electrolysis cell in use, making sure there is no gas build up in the mini test tube before the experiment takes place, Pouring out the most of what there is out of the measuring cylinder and making sure there is no rust on the crocodile clips as it will decrease the current. Extending the experiment would give a better understanding on how it works and the effect it has on different variables. After finding the results for different amounts of acid I could extend by changing the concentration and go to the other extreme by using an alkali. The electrodes could be changed in having different surface areas. Changing the temperature would also be interesting already knowing that it has already somehow affected my results and already having a rough prediction what would change. ?? ?? ?? ?? ...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 Aqueous Chemistry 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
  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work