8. Calculate the standard cell potential for:Ni M. What is the In a certain cell

Question

8. Calculate the standard cell potential for:Ni M. What is the In a certain cell, the concentration of Sn? is 0,0010o M, and the concentration of Ni is 0.10 potential of this cell? Show your work below -100 mat mat 0.0010m" uautont [Sr?" 0.097 m 9. A non-standard Cu/Zn voltaic cell was constructed using the procedure described in the experiment. The solution in contact with the Cu electrode was 1.0 MCuSos(ag). The solution in contact with the Zn electrode was an aqueous ZnSO, solution of unknown molarity. The non-standard voltage of the cell was determined to be I1 22 V. What is the molarity of the ZnS0, in contact with the Zn electrode? The standard cell potential for the cell is E +1.10 V 11-12 1685

Explanation / Answer

9.

Over all cell reaction is,

Cu2+ (aq.) + Zn (s) ------------> Cu (s) + Zn2+ (aq.)

Nernst equaiton for cell potential

Ecell = E0cell - ( 0.05916 / n ) * Log[Zn2+]/[Cu2+]

1.22 = 1.10 - ( 0.05916 / 2 ) * Log[Zn2+] / (1.0)

Log[Zn2+] = (1.22 - 1.10) * 2 / ( - 0.05916 )

Log[Zn2+] = - 4.06

[Zn2+] = 10-4.06

[Zn2+] = 8.77 * 10-5 M

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