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.

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

2) Calculate ƒ¢G for the full-cell reaction at 25�‹C when [CrO42-] = 1.00 M?

3) What is the potential of this cell at 25�‹C when [CrO42-] = 1.10�~10-6 M?

4) For a solution of unknown [CrO42-], the measured potential for the cell at 25�‹C is 0.363 V. What is [CrO42-] (in mol/L)?

2 answers

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