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

The electrolysis of Sodium Sulfate (Na2SO4)

Extracts from this document...


Electrolysis I. The electrolysis of Sodium Sulfate (Na2SO4) Data Collection The side of anode and cathode The color before electrolysis The changes during electrolysis Anode Colorless The color stays the same and there is bubble. Cathode Colorless The carbon produces purple color and there is bubble. Data analysis & Conclusion From the experiment, after the electrolysis of Na2SO4, the color of cathode side becomes purple and there is bubble. The same thing happens in the other side, which is anode, bubble is also formed. ...read more.


If acid is added by phenolphthalein, the solution will stay the same, which is colorless. In both sides, cathode and anode, there is bubble, which is produced by hydrogen. In conclusion, II. The electrolysis of Potassium Iodide (KI) Data collection The side of anode and cathode The changes during electrolysis The changes after adding phenolphthalein The changes after adding starch Anode The color turns into brownish The color stays brownish and precipitates The color stays brownish and precipitates Cathode The color stays colorless and there is bubble. ...read more.


Also in cathode, the color changes into purple after being added phenolphthalein to show that the solution is base. It is because OH- + PP becomes purple. However, after being added starch the color turns into colorless and precipitates. In anode, oxidation occurs after electrolysis and Iodine is being oxidized so that the solution the color changes into brownish. However, after being added phenolphthalein or starch the color remains the same, colorless. It is because H+ + PP becomes colorless. The reaction is in the following: Cathode --> 2H2O + 2e- --> 2OH- + H2 Anode --> 2I- --> I2 + 2e- In conclusion, ...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

Here's what a teacher thought of this essay

This report has some interesting and useful information. However it also has some mistakes and is missing key pieces of information particularly surrounding the process of electrolysis itself.

Overall this report would be 2*

Marked by teacher Cornelia Bruce 01/12/2012

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

See related essaysSee related essays

Related GCSE Changing Materials - The Earth and its Atmosphere essays

  1. Peer reviewed

    To find out how current affects the rate of electrolysis

    3 star(s)

    I also predict that carbon dioxide would be formed, as oxygen is being released fro the hydroxide the oxygen will react with the carbon anode to form carbon dioxide this, attacks the carbon anode and produces carbon dioxide.

  2. GCSE Chemistry - Electrolysis Coursework

    It was necessary to have a rough idea of how the results would turn out. This is possible to work out by using a series of simple of equations: Ø Charge (C) = Current (A) x Time (sec.) Ø Moles of Electrons or Faradays = Charge (C)

  1. The aim of this experiment is to determine the order of the reactivity series ...

    The enclosed periodic table displays metals and non-metals. The metals at the top of the reactivity series have a tight bond with their carbonates. Their atoms are stable, and these atoms become more stable the higher in the reactivity series you go.

  2. Investigating The Reactivity Of The Metals Iron, Magnesium, Zinc, Copper And Calcium And Their ...

    another set of results to give and accurate reading of the temperature. There were a few anomalous results but the results were accurate enough. The results were reliable and proved that my prediction was correct and the experiment was carried out correctly.

  1. Investigate whether voltage affects the rate of electrolysis?

    that I have noted its existence Analysing evidence: These graphs proves to you that as the voltage is increased so does the rate of electrolysis. The graph shows you the weight of the cathode grew noticeably as the copper was taken from the anode and attracted to it.

  2. Investigating how the voltage produced by a simple cell is related to the reactivity ...

    The temperature is something I cannot control but will stay at room temperature and not receive any additional cooling or heating. However, Icannot control the amount of surface area exposed to the electrolyte, as I must work with the materials provided by school.

  1. Electrolysis of Sodium Chloride - NaCl.

    I will obviously need to change the concentration of Sodium Chloride in order to do the test. I also need to keep the electrodes the same distance apart during each test as their distance apart will affect the results I obtain - 2cm apart and make sure I use the same electrodes throughout the experiment.

  2. Importance of electrolysis in our daily lives

    The whole surface of the broken/damaged object or component is covered with wax except where the repair is needed and is made the cathode and dipped in an electrolysis bath. The metals deposits on the dent or the part open part.

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