Chemistry instructors are known for their attraction towards shiny and expensive

Question

Chemistry instructors are known for their attraction towards shiny and expensive metals, as well as their tendency for turning these into electrochemical cells, Predict the standard cell potential (Edegree) for a "Noble-Cell" cell, using the information below. Briefly describe the difference between Edegree and E. If the initial cell contains 1M Au^3+(aq) and IM Ag+(aq), calculate the E value for the cell, at 25degreeC, when 50% of the Au^2+(aq) ions have been consumed. Calculate the equilibrium constant, K, at 25degreeC, for the "Noble-Cell" Cell. Calculate the deltaGdegree for the Daniell cell

Explanation / Answer

a)

E0cell = E0cathode - E0anode

   = 1.52 - 0.7996

= 0.7204 v

b) E0cell means at standard conditions cell potential, Ecell means at the

given conditions.

c) Ecell = E0cell - (0.0591/n)log((Ag+)^3/Au+3)

     = 0.7204 - (0.0591/3)log(0.5^3/0.5)

   = 0.732 V

d) DG0 = - nFE0cell

   DG0 = -3*96500*0.7204

     = -208.55 kj

e) DG0 = - RTlnK

   -208556 = -8.314*298lnk

   k = 3.61*10^36

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