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The electrolysis of Sodium Sulfate (Na2SO4)

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Introduction

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.

Middle

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.

Conclusion

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.

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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

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