Homework help 14.11  [ENDORSED]

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tobeylee_1C
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Joined: Sat Jul 23, 2016 3:00 am

Homework help 14.11

Postby tobeylee_1C » Sat Feb 11, 2017 2:29 pm

I was doing part all the parts of the question when reversing the reduction reactions of the anode to make it the oxidation part of the redox reaction I notice that the solutions manual didn't change the sign of E even though it was reversed. I was wondering if I was doing it wrong or there's an error in the solutions manual.

Maggie Bui 1H
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Re: Homework help 14.11  [ENDORSED]

Postby Maggie Bui 1H » Sat Feb 11, 2017 3:43 pm

Though it doesn't explicitly reverse the reduction potential, the solutions manual does essentially the same thing. Instead of reversing the reduction potential and then adding the two half-reaction potentials to get the standard cell potential, it just subtracts the reduction potential of the anode from that of the cathode.



In the equation above, the signs of E don't change, but the reduction potential of the anode is subtracted from that of the cathode.




This equation is a depiction of what we do when we reverse the reduction potential before adding. The two are equivalent.

Ariana Murillo 2O
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Joined: Tue Jul 19, 2016 3:00 am

Re: Homework help 14.11

Postby Ariana Murillo 2O » Sun Feb 12, 2017 3:22 pm

For question 11, how did they know to reverse the anode half-reaction?

tobeylee_1C
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Joined: Sat Jul 23, 2016 3:00 am

Re: Homework help 14.11

Postby tobeylee_1C » Sun Feb 12, 2017 8:35 pm

Ariana the anode is reversed because it oxidizes and half-reaction given is a reduction form of the anode.

JaeHoCho1B
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Re: Homework help 14.11

Postby JaeHoCho1B » Sun Feb 12, 2017 8:54 pm

When we are solving these questions, will be given the the standard potential on the exam?

Zoe Robertson 2H
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Re: Homework help 14.11

Postby Zoe Robertson 2H » Sun Feb 12, 2017 9:17 pm

Is the the cathode in this example not given as an oxidation instead of reduction? Don't you read the diagram inside out?


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