Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Reading the Standard Reduction Table?
For
Cu(2+) + 2e(-) --> Cu E=+0.34V
Does this mean the reaction requires 0.34V of energy to occur?
1 Answer
- 9 years agoFavorite Answer
This is only half of a reaction--the reduction half. You would need an oxidation half-reaction to have a complete chemical reaction.
To write an oxidation half-reaction, choose another half-reaction from the standard reduction table. Now, write it in the reverse direction. Also, change the sign of the potential (E).
Say we use chlorine for the oxidation:
2Cl(-) --> Cl2(g) + 2e(-) E=-1.36V
To come up with a chemical reaction, add the two half-reactions. Make sure the number of electrons cancel. And the cell potential would just be the sum of the two Es.
Cu(2+) + 2Cl(-) --> Cu + Cl2(g) E=+0.34V-1.36V=-1.02V
The 0.34V is the amount of energy that this half-reaction uses or produces relative to the hydrogen half-reaction: 2H(+) + 2e(-) --> H2(g) E=0V
