Asked by Someone PLEASE HELP!
                Find the emf for the cell 
Cr(s) |Cr3+(aq, 0.37 M) ||
Pb2+(aq, 0.0095 M) | Pb(s).
Answer in units of V
I don't know what to do
            
        Cr(s) |Cr3+(aq, 0.37 M) ||
Pb2+(aq, 0.0095 M) | Pb(s).
Answer in units of V
I don't know what to do
Answers
                    Answered by
            DrBob222
            
    Correct the reduction potential for  Cr^+3/Cr for the 0.37 M.
E = Eo - (0.05916/n)*log (Cr)/(Cr^+3)
Correct the Pb reduction potential for 0.0095M
E = Eo-(0.05916/n)*log(Pb)/(Pb^+2)
Then plug in the numbers for
2Cr + 3Pb^+2 ==> 2Cr^+3 + 3Pb(s)
(You will need to change the sign for the Cr couple since that is being oxidized. You do NOT multiply potentials by the coefficients.).
    
E = Eo - (0.05916/n)*log (Cr)/(Cr^+3)
Correct the Pb reduction potential for 0.0095M
E = Eo-(0.05916/n)*log(Pb)/(Pb^+2)
Then plug in the numbers for
2Cr + 3Pb^+2 ==> 2Cr^+3 + 3Pb(s)
(You will need to change the sign for the Cr couple since that is being oxidized. You do NOT multiply potentials by the coefficients.).
                    Answered by
            Someone PLEASE HELP!
            
    I got 
.6-(.0592/6)*log((.37)^2/(.0095)^3)
which ends up being .558V
Is that right?
    
.6-(.0592/6)*log((.37)^2/(.0095)^3)
which ends up being .558V
Is that right?
                    Answered by
            DrBob222
            
    That isn't the emf of the cell. You didn't follow my instructions. Those "corrections" I told you to make are separate corrections. You've tried to do it all together and you appear to be confusing this with the equilibrium constant. 
    
                    Answered by
            Someone PLEASE HELP!
            
    .73 - (.05916/6)*log(2)/(2) for Cr?
-.13 - (.05916/6)*log(3)/(3) for Pb?
    
-.13 - (.05916/6)*log(3)/(3) for Pb?
                    Answered by
            DrBob222
            
    No.
n is 3 for Cr
n is 2 for Pb
(Cr) is 1 (That's the standard state).
(Pb) is 1. Standard state.
(Cr^+3) = 0.37M from the problem.
(Pb^+2) = 00095M from the problem.
The reduction potential for Cr is -0.73 so you should change that.
The Pb reduction potential is ok.
When you finish the above revisions, THEN
you reverse the sign of the Cr, keep the sign for Pb, and add them together WITHOUT REGARD TO THE NUMBER OF ELECTRONS. That will give you the EMF for the cell that you have set up.
    
n is 3 for Cr
n is 2 for Pb
(Cr) is 1 (That's the standard state).
(Pb) is 1. Standard state.
(Cr^+3) = 0.37M from the problem.
(Pb^+2) = 00095M from the problem.
The reduction potential for Cr is -0.73 so you should change that.
The Pb reduction potential is ok.
When you finish the above revisions, THEN
you reverse the sign of the Cr, keep the sign for Pb, and add them together WITHOUT REGARD TO THE NUMBER OF ELECTRONS. That will give you the EMF for the cell that you have set up.
                    Answered by
            AntiDrBob222
            
    So Dr. Bob the equilibrium constant has K and this does not
We are not confused. And it should be all in one.
    
We are not confused. And it should be all in one.
                    Answered by
            yo
            
    @someone PLEASE help, i got the same answer as u
    
                    Answered by
            gay
            
    u suk
    
                    Answered by
            nah
            
    what the heck kid
    
                    Answered by
            DrBob222sux
            
    0.558 is correct
    
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