Do you wanna be rich? We can help you! Let's see a video first which teaches you the way to be rich!
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Transcript of Do you wanna be rich? We can help you! Let's see a video first which teaches you the way to be rich!
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Do you wanna be rich?
We can help you!
Let's see a video first which teaches you the way to be rich!
![Page 2: Do you wanna be rich? We can help you! Let's see a video first which teaches you the way to be rich!](https://reader034.fdocuments.in/reader034/viewer/2022051821/5697c0151a28abf838ccdd24/html5/thumbnails/2.jpg)
Electrorefining
Phyllis ZhangDiana GaoCindy Zhang
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Electrorefining is the process of purifying a metal by electrolysis.
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+
Slab of impure copper containing such impurities as: Zn, Pb, Ag(Anode)
Pure Cu(Cathode)
- DC power supply
CuSO4(aq)
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CuSO4(aq)
Pure Cu(Cathode)
DC power supply
- +
Cu, Zn, Pb, Ag
Examine the following cell
Zn2+
Zn2+
Pb2+
Cu2+
Cu2+
Cu2+
Cu2+
Cu2+
Cu2+ Cu2+
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The cathode reaction:
The Cu2+ in solution is preferentially reduced at the cathode but none of the Pb2+ or Zn2+ can be reduced.(Cu2+ exists in larger amounts and has a higher reduction potential than Zn2+ and Pb2+.)
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In summary:
No metals above Cu on the table can oxidize and go into solution, and no metal below Cu on the chart can reduce and come back out of solution. As a result, only Cu is involved in both the oxidation and reduction.
Impure anode pure cathode
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Exercise----P246
An aqueous solution of SnSO4 was electrolyzed using tin electrodes. The anode contained a few percent of silver, copper and zinc as impurities. Which substances(s) will be oxidized at the anode? Which substances(s) will be reduced at the cathode?
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Applications
leadcopper
goldsilverzinc
aluminiumchromium
cobaltmanganese
the rare-earth and alkali metals
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Bibliography:the video:http://v.youku.com/v_show/id_XMjk5MDEwMTM2.html
the pictures:http://image.baidu.com
information:http://en.wikipedia.org/wiki/Electrorefining
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That's all! Thank you!
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Zn
Cu
Ag
Au
Pt
Pb