Half - prevents Fe 2+ and Ce 4+ from mixing. You need two...

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Half-Reactions Oxidation/reduction reactions are important because we can exploit them as a way of  generating electrical current. For example, we know that Ce 4+  will pull an electron away  from Fe 2+  when we mix the two in solution. The trick to making a battery is to find a  way to make Ce 4+  pull an electron from Fe 2+  when they are not mixed together in a  single solution. In order to do this we set up two  1/2 reactions  in separate beakers and connect them  with a  salt bridge . The  salt bridge  electrically connects the two beakers, but 
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Unformatted text preview: prevents Fe 2+ and Ce 4+ from mixing. You need two 1/2 reactions to make a reaction, so, we add them together. Fe 2+ → Fe 3+ + e-Ce 4+ + e-→ Ce 3+ __________________________________ Fe 2+ + Ce 4+ → Fe 3+ + Ce 3+ Notice that electrons on both sides of the half-reactions must cancel each other out when added together. What about other atoms and molecules. How do you know if one chemical substance is strong enough to take an electron from another? We simply refer to a list known as the activity series ....
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Half - prevents Fe 2+ and Ce 4+ from mixing. You need two...

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