# Chemistry

Write the half cell reactions of the following?
1) Cu/Cu^2+(0.1M)//Ag^+(0.1M)/Ag 2) Zn/Zn^2+ (0.1M)//Cu^2+(0.1M)/Cu 3) Zn/Zn^2+(0.1M)//Ag^+(0.1M)/Ag 4) Zn/Zn(NH3)4^2+*0.5M)//Ag^+(0.1M)/Ag 5) Zn^2+(aq)+4NH3(aq) <--> ...show more

Also, around what range of numerical results would be expected of their cell potentials, polarities, Kfs, Keqs, and E cell values would be expected here?

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1. You haven't asked a question here but more like a book of questions. Do you just want to "compare" answers or do you have a real problem with understanding a particular part? Clarify what you don't know and explain in detail and we can help you through it. I just don't feel like writing a book today.

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posted by DrBob222
2. I want to compare answers. I recently did an experiment on Galvanic Cells, and I obtained readings from a volt meter, and I was wondering if there were specific results in which my results must come into close range.
My cell potentials listed in order from the question are -0.12, -0.13, 0.86, 0.44, and 0.56. I had problems working the machine and I added that as a source of error.

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posted by Ingrid
3. Also for my half reactions, I got these answers from the first 3 in order from the question listed above,
Cu-->Cu^2+
Zn^2+-->Zn
Ag^+-->Ag
Someone was explaining to me on how to write half reactions over and over again and I am still confused, and I know my answers are definitely wrong.

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posted by Ingrid
4. I just realized my question was cut off, sorry:

Write the half cell reactions of the

1) Cu/Cu^2+(0.1M)//Ag^+(0.1M)/Ag
2) Zn/Zn^2+ (0.1M)//Cu^2+(0.1M)/Cu
3) Zn/Zn^2+(0.1M)//Ag^+(0.1M)/Ag
4) Zn/Zn(NH3)4^2+*0.5M)//Ag^+(0.1M)/Ag
5) Zn^2+(aq)+4NH3(aq) <--> Zn(NH3)4^2+(aq)
6) Ag/AgCl//Ag^+(0.1M)/Ag

Also around what range of numerical results would be expected of their cell potentials, polarities, Kfs, Keqs, and E cell values would be expected here?

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posted by Ingrid
5. For #2.
The half rxn are
Zn ==> Zn^2+ + 2e and
Cu^2+ + 2e == Cu

To find Ehalf cell for Zn use
E = Eocell - (0.05916/n)*log[1/(Zn^2+)]. Plug in the (Zn^2+), calculate Ehalf cell (using the reduction potential you find in your standard potential table), then reverse the sign and add it to the potential you calculate for Cu half cell. That will give you the theoretical Ecell at the concns you have listed for Cu^2+ and Zn^2+. It will also give you the sign of Ecell.
Use Ecell calculated to arrive at Keq or Kf from nFE = RT*lnK

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posted by DrBob222

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