A voltaic cell is made by placing a zinc electrode in a compartment in which the

Question

A voltaic cell is made by placing a zinc electrode in a compartment in which the Zn2+  concentration is 2.0 × 10–5M and by placing a Pt electrode in the other compartment, in which the H+ concentration is 3.4 M and PH2 = 1.00 atm. The Zn2+/Zn half-cell reduction potential is –0.76 V, and the H+/H2 half-cell reduction potential is 0.00 V.  What is the equilibrium constant at 25°C for the spontaneous cell reaction?

Balance the fo lowing ouidatin reducton eqation iw base solution 15 gi 3 A voltaic cell is constructed from the following half cells: a magnesium electrode in magresium sufate solution and a nickel electrode in nickef sulfate solution The hall-reactions are lan) Ze Sketch the cel, lebeting the anode and cathode land the electrode reactions), and show the direction of electron flow and the movement of cations tsalt kon Wirite the cell notation for a voltaic cell for this half reaction (s prti"

Explanation / Answer

E0cell = E0cathode - E0anode

         = 0 - (-0.76)

        = 0.76 v

DG0 = -nFE0cell

     = -2*96500*0.76

     = -146680 joule

DG0 = -RTlnk

-146680 = -8.314*298lnk

k =equilibrium constant = 5.15*10^25

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