# Question

A chemist wishes to determine the concentration of CrO42- electrochemically. A cell is constructed consisting of a saturated calomel electrode (SCE; see Exercise 24) and a silver wire coated with Ag2CrO4. The E° value for the following half reaction is 10.446 V relative to the standard hydrogen electrode: Ag2CrO4 + 2e- → 2Ag + CrO42-
a. Calculate E° cell and ΔG at 25oC for the cell reaction when [CrO42-] = 1.00 mol/ L.
b. Write the Nernst equation for the cell. Assume that the SCE concentrations are constant.

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