Saturday
April 19, 2014

Homework Help: chemistry

Posted by fenerbahce on Friday, July 20, 2012 at 10:02am.

How do you calculate the theoretical cell voltage?

1) Zn|Zn^+2 (1M)| Cu|Cu^+2 (1M)

okay so by looking at example this example

Calculate the emf (voltage) for the following reaction:
Zn(s) + Fe2+ → Zn2+ + Fe(s)
Write the 2 half reactions:
Zn(s) → Zn2+ + 2e
Fe2+ +2e → Fe(s)

look up the standard electrode potentials in the table above
Zn2+ + 2e → Zn Eo = -0.76V
This equation needs to be reversed, so the sign of Eo will also be reversed.
Zn(s) → Zn2+ + 2e Eo = +0.76V
Fe2+ +2e → Fe(s) Eo = -0.41V

Add the two equations together:
Zn(s) → Zn2+ + 2e Eo = +0.76V
Fe2+ + 2e → Fe(s) Eo = -0.41V
Zn(s) + Fe2+ → Zn2+ + Fe(s) Eocell = +0.76 + (-0.41) = +0.35V









I came up with the answer: 1.11

So am I on the right track?

AND ALSO VERY VERY IMPORTANT**
for the first one they more have 1 M

but for this question:

Cu|Cu^+2 (1M) Cu|Cu^+2(0.1 M)

see how one has 1M and the other 0.1M will that make a difference in the calculation thank you.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

chemistry - the measured cell voltages are supposed to be smaller than the ...
Chemistry - What is the half-cell reactions in a hydrogen fuel cell, and ...
chemistry help!! - nsider the following electochemical cell. Pt | Cr3+ (2.7010-4...
chemistry - The Measured voltage of the cell Pt H2 (1.0atm) H+ // Ag+ (1.0M) Ag ...
Chemistry - Consider the following electochemical cell. Pt | Fe3+ (0.0600 M), ...
chemistry - A certain voltaic cell has a standard cell voltage of 1.22 V, and 3 ...
chemistry - How do you calculate the theoretical cell voltage? 1) Zn|Zn^+2 (1M...
Chemistry - An electrochemical cell is created using gold and magnesium half-...
Chemistry - Choose the two half-reactions from a table of standard reduction ...
chemistry - The reaction described by the equation Zn + Hg2Cl2 <--> 2Hg +...

Search
Members