2) Reference Electrodes The E value for the following reaction is 0.446 V relative to the standard hydrogen electrode (SHE):

2) Reference Electrodes

The E° value for the following reaction is 0.446 V relative to the standard hydrogen electrode (SHE):

Ag2CrO4(s) + 2e- –> 2Ag(s) + CrO42-(aq)A chemist wishes to determine the concentration of CrO42- electrochemically. A cell is constructed consisting of a saturated calomel electrode (SCE; which has a reduction potential of 0.242 V relative to the SHE) and a silver wire coated with Ag2CrO4 and suspended in a CrO42- solution.

a) What is the potential of this cell at 25°C when [CrO42-] = 1.00 M?

got this one  0.204 V 

b) Calculate ΔG for the full-cell reaction at 25°C when [CrO42-] = 1.00 M?

got this one  -3.94×101 kJ 

c) What is the potential of this cell at 25°C when [CrO42-] = 9.90×10-9 M?

d) For a solution of unknown [CrO42-], the measured potential for the cell at 25°C is 0.327 V. What is [CrO42-] (in mol/L)?

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