There isn't much on chemguide about A2 Electrochemistry. You folks are going to have to depend quite heavily on my notes this time. There's some on AS Electrochemistry on Chemguide, which includes Electrolysis of Brine
Basic pointers regarding the drawing of the experimental setup:
1) SHE always on the left in diagram
2) Sign of electrode potential as measured from voltmeter = charge of RHS electrode
3) Labeling of direction of flow of electrons is done ONLY on the voltmeter wire
Basic pointers regarding the construction of a cell diagram:
1) (-) on the left; (+) on the right
2) | to denote a boundary between electrode & electrolyte
3) // to denote the salt bridge
4) Either side of a cell diagram will be the solid electrodes
5) Electrons are lost on the left, and gained on the right
N.B. DO NOT CONFUSE THE Cell Diagram with the experimental setup diagram.
If anyone has good links for Electrochemistry A2 please feel free to post!
Update: So far, in class, we've gone through the cell diagrams / experimental setup for measuring the electrode potentials for Zn2+/Zn, Cu2+/Cu & Cl2/Cl- half-cells.
The class will go home and research on the case for measuring the standard electrode potentials for Cr3+/Cr2+ & Fe3+/Fe2+ systems.
Update (14/4/2010): Pt(s)|Cr2+(aq),Cr3+(aq)//Fe3+(aq),Fe2+(aq)|Pt(s)
AND
Zn(s)|Zn2+(aq)//Cu2+(aq)|Pt(s)
DONE in class for those who were polite enough to be PRESENT.
Subscribe to:
Post Comments (Atom)
Hahah this may be a little bit inappropriate but the idea of cell notation is simply genius! Made the whole learning process so much easier! :)
ReplyDeleteI agree. Not only do you know about the reactions at the cathode (-ve; left), and the anode (+ve; right), but also the individual half-equations --> overall equation. Also, it gives you a means to calculate the electrode potential of the cell.
ReplyDelete