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Electrochemical cell- cell diagram
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Topic: Electrochemical cell- cell diagram (Read 4714 times)
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sarah92
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Posts: 27
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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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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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Corribus
Chemist
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A lover of spectroscopy and chocolate.
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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What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent? - Richard P. Feynman
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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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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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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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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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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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
, I don't see it
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sarah92
Regular Member
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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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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. Fe
2+
+Ti
3+
Fe
3+
+Ti
2+
b. E°=-1.14 (since Fe
2+
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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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|Fe
2+
,Fe
3+
||Ti
3+
,Ti
2+
|Pt
By convention, the anode is on the left, and E = E
R
- E
L
is positive.
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sarah92
Regular Member
Posts: 27
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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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