So if they give you two half rxn, and it says they are an electrochemical cell, how do you know if it is electrolytic (therefore -E total), or should be the opposite (+) E total?
(may be broke/outdated!)
So if they give you two half rxn, and it says they are an electrochemical cell, how do you know if it is electrolytic (therefore -E total), or should be the opposite (+) E total?
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One Response
Well, you first have to assume that it’s under standard temperature conditions.
You can then use a table of standard reduction potentials of half-cells to calculate the individual Eo voltages of the anode and cathode. With this table, you will be able to determine whether the half-reaction should be the oxidation or reduction half-reaction. If you add up their voltages, you will come up with either a positive or negative value. Those that are negative require voltage to be inputed in (e.g.: throw a battery) before the reaction can occur.
This link has one such table (get RID of the SPACES before you try to type it into the address bar: Yahoo! answers doesn’t allow for pdf links).
http://www.ed.gov.nl.ca/edu/
k12/pub/courses/resources
/chem/standardreduction
potentials.pdf
[Answer: see above]