Homework Help: chemistry

Posted by LALA on Sunday, February 21, 2010 at 1:37pm.

a galvanic cell: A copper electrode is placed in a Cu(NO3)2 electrolyte. An iron electrode is placed in a Fe(NO3)3 electrolyte.
a) What will happen to the voltage if sodium sulfide solution was added to the copper solution(I found that CuS(solid precipitate) will be formed, but i'm thinking it will reduce the voltage but im not sure)

b) What will happen is Na2S was added to the iron solution

if this helps, here are the half reactions for each half cell

Fe^3+ + e ---> Fe ^2+
Cu^2+ + 2e ---->Cu

chemistry - DrBob222, Sunday, February 21, 2010 at 2:05pm
Sulfide added to the copper nitrate will ppt CuS.
CuS ==> Cu^+2 S^=
Remember CuS has a Ksp (solubility product) so the E value for that half cell will be changed to reflect the change of Cu concentration from the initial value (not listed in your post) to the new value present in a saturated solution of CuS.

b. Same thing for the iron solution.
Fe^+3 + S^= ==> Fe2S3 and there is a Ksp for Fe2S3

Answer this Question

Related Questions

chemistry - A voltaic cell is contructed in which a copper wire is placed in a 1...
Chemistry - Little confusing!! I need help PLZ!!! Two half cells in a galvanic ...
chemistry (electrochemistry) - 1) For the following electrochemical cell Cu(s)|...
chemistry - A galvanic cell has an iron electrode in contact with 0.20 M FeSO4 ...
Chemistry - Im having trouble on a question Im not sure what it is they are ...
chemistry - A chemist wishes to determine the concentration of CrO4-2 ions ...
College Chemistry - Calculate the electrode potential of a copper half-call ...
AP Chem - An electrochemical cell consists of a nickel metal electrode immersed ...
Chemistry - A galvanic (voltaic) cell consists of an electrode composed of ...
Chemistry - Will Zinc react with Zn(NO3)2, Cu(NO3)2,Pb(NO3)2, Mg(NO3)2, AgNO3, ...

For Further Reading

First Name:
School Subject:
Answer: