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Topic: Electrochemical cell- cell diagram  (Read 4714 times)

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Offline sarah92

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Electrochemical cell- cell diagram
« on: August 11, 2015, 04:33:11 PM »
An electrochemical cell consists of a half-cell in which a platinum wire dips into a solution 0.80 M with respect to Fe3+ and 0.05 M with respect to Fe2+. The other half-cell consists of a platinum wire immersed in a solution which is 0.10 M in both Ti2+ and Ti3+. The respective half-cell reductions and potentials are:

Ti3+ + e-  Ti2+      E = -0.37 V
Fe3+ + e-  Fe2+      E = +0.77 V

   (i)   Write out the cell diagram in standard notation; assume the use of a salt bridge between the half-cells.

Pt | Fe3+ + Fe2+ || Ti2+ + Ti3+ | Pt

Is that the correct cell diagram? I'm finding the question is a bit confusing.
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Offline sarah92

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Re: Electrochemical cell- cell diagram
« Reply #1 on: August 13, 2015, 12:32:38 PM »
Can anyone give an idea of whether its right or wrong please.
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Offline Corribus

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Re: Electrochemical cell- cell diagram
« Reply #2 on: August 13, 2015, 12:46:35 PM »
The first step is to determine what the oxidation and reduction half reactions are. Do you know how to do this?

This link may be helpful to you.

http://chemwiki.ucdavis.edu/Analytical_Chemistry/Electrochemistry/Voltaic_Cells/Electrochemical_Cell_Conventions
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Offline sarah92

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Re: Electrochemical cell- cell diagram
« Reply #3 on: August 13, 2015, 05:22:22 PM »
I've reworked the cell diagram:

Pt I Ti(aq)2+ I Ti(aq) II Fe(aq)3+ I Fe(aq)2+ I Pt

Is this the right solution now
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Offline sarah92

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Re: Electrochemical cell- cell diagram
« Reply #4 on: August 13, 2015, 07:17:43 PM »
If anyone could look at the above cell diagram and tell me if its right please.
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Offline sarah92

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Re: Electrochemical cell- cell diagram
« Reply #5 on: August 16, 2015, 03:31:16 PM »
Hey

If anyone could look at this and tell if me its right would really appreciated it.

Thank you.
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Offline orthoformate

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Re: Electrochemical cell- cell diagram
« Reply #6 on: August 16, 2015, 05:38:37 PM »
Can you copy and paste the question exactly as it is written? Or give a link directly to the problem?

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Offline sarah92

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Re: Electrochemical cell- cell diagram
« Reply #7 on: August 16, 2015, 07:40:24 PM »
Hello

I have added the attached the question, its part b.

Thank you.
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Offline orthoformate

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Re: Electrochemical cell- cell diagram
« Reply #8 on: August 16, 2015, 10:47:05 PM »
I'm sorry...I am probably blind 8), I don't see it
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Offline sarah92

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Re: Electrochemical cell- cell diagram
« Reply #9 on: August 17, 2015, 05:16:46 AM »
Sorry looks like it didn't upload. I have attached it now
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Offline orthoformate

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Re: Electrochemical cell- cell diagram
« Reply #10 on: August 17, 2015, 06:16:11 PM »
This would be my answer:

a.  Fe2++Ti3+  ::equil:: Fe3++Ti2+

b. E°=-1.14 (since Fe2+ is being oxidized, the reduction potential is reversed)

c.

E=E°-(RT/nF)ln(Q)

here's Q:https://en.wikipedia.org/wiki/Reaction_quotient (products/reactants)

Disclaimer!
I am not a chemistry teacher, just a student like you  :)
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Offline mjc123

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Re: Electrochemical cell- cell diagram
« Reply #11 on: August 18, 2015, 04:40:45 AM »
The question asks for the cell diagram; the OP got it almost right:
Pt|Fe2+,Fe3+||Ti3+,Ti2+|Pt
By convention, the anode is on the left, and E = ER - EL is positive.
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Offline sarah92

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Re: Electrochemical cell- cell diagram
« Reply #12 on: August 18, 2015, 06:03:47 AM »
Thank you, now I Know.
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