Homework Help: Chemistry

Posted by jake on Wednesday, May 28, 2008 at 4:28pm.

A chemist wishes to determine the concentration of CrO4-2 ions electrochemically. A cell is constructed consisting of saturated calomel electrode (SCE) and a silver wire coated with Ag2CrO4. The SCE is composed of mercury in contact with a saturated solution of calomel (Hg2Cl2). The electrolyte solution in the half-cell is saturated KCl. The E°cell of the SCE half-cell is +0.242 V with respect to the standard hydrogen electrode. The half-reaction for the reduction of Ag2CrO4 is shown below.

What would I have to put into the cell?

Chemistry - DrBob222, Wednesday, May 28, 2008 at 5:30pm
Jake--
Variations of this problem have been posted two or three times over the last few days and I still don't get what you are asking. I assume the half-reaction for the reduction of Ag2CrO4 is given. Can you please include that here? Second, "what would I put into the cell" where? Where are you being asked to put something? Third, you don't list a voltage for the complete set up. You can't calculate a concentration of anything without the cell potential.

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