Friday
April 18, 2014

Homework Help: Chemistry

Posted by Chloe on Tuesday, May 14, 2013 at 2:24am.

Using your experimental data, calculate E0cell. Standard voltaic cells contain 1M solutions, but we used 0.10M solutions in all of our half cells. Use the Nernst equation to calculate the standard cell potential (E0cell) from your measured Ecell and Qrxn.

Data:
Nernst Equation: Ecell=E0cell -RT/nF ln Q

Questions:

1. I am not sure if i did the E0cell right equation, I switched the Ecell to get the E0cell..and "n" is equal to 2 moles being transfer?

I calculated:
Measured Ecell = 0.445V
Overall rxn = Cu(s)+Pb2(aq) ~ CU2+(aq) + Pb(s)
N= 2moles??

Re-arrange the equation:
E0cell = Ecell - RT/nF ln Q
E0cell = 0.445V -(8.314 j/k*mol *298K)/(2 moles * 96500 c/mole e-) ln (0.10)
= -2.30


2. Overall reaction:
3Pb(s) + 2Al 3+ (aq) ~ 3Pb2+(aq) = 2Al(s)
Measured Ecell(V) = 0.086V
N= 6moles?? (3*2 moles)

0.086V- (8.314 j/k*mol * 298K)/ (6moles * 96500 C/mole e- ) ln (0.10/0.10^6) = 0.94??

Is this right? Please help! Thank you in advance!

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chemistry again - Two voltaic cells are to be joined so that one will run the ...
Chemistry - A voltaic cell designed to measure [Cu2+]is constructed of a ...
chemistry - Calculate the cell potential of voltaic cells that contain the ...
chemistry - Consider two cells, the first with Al and Ag electrodes, and the ...
Chemistry - How to calculate Q in Nernst Equations, we used 0.10M solutions in ...
electrochemistry - Calculate the cell potential of voltaic cells that contain ...
Chemistry - In chemistry, we did a lab using zinc as the standard and forming ...
chemistry (electrochemistry) - 1) For the following electrochemical cell Cu(s)|...
chemistry - Consider two cells, the first with Al and Ag electrodes, and the ...
Chemistry - The following voltaic cell registers an E cell = 0.100V. Pt|H2(g 1 ...

Search
Members