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Topic: Nature of Mercury Ions? Please help me understand this...  (Read 2836 times)

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Offline Fivestar496

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Nature of Mercury Ions? Please help me understand this...
« on: December 06, 2012, 05:49:13 PM »
For years it was not clear whether mercury (I) ions existed in solution as Hg+ or Hg22+. To distinguish between these two possibilities, we could set up the following system:

                                   Hg(l) | soln A || soln B | Hg(l)

Where solution A contained 0.263 g mercury (I) nitrate per liter and solution B contained 2.63 g mercury (I) nitrate per liter. If the measured emf of such a cell is 0.0289 V at 18 oC, what can you deduce about the nature of the mercury ions?



Offline Borek

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Re: Nature of Mercury Ions? Please help me understand this...
« Reply #1 on: December 06, 2012, 06:23:19 PM »
You have to show your attempts at solving the question to receive help. This is a forum policy, described in the forum rules.

This very question was discussed on the forum this year.
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Offline Fivestar496

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Re: Nature of Mercury Ions? Please help me understand this...
« Reply #2 on: December 06, 2012, 06:49:00 PM »
I know I'm suppose to use the Nernst equation for this problem but i'm lost on where to even begin and what exactly i'm looking for.  I know I have the data to plug in for emf, temperature, and the constants for the equation but what about lnQ or E?

Offline Borek

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Re: Nature of Mercury Ions? Please help me understand this...
« Reply #3 on: December 07, 2012, 05:13:23 AM »
This is a concentration cell, with a tenfold difference in concentrations. Rings a bell?
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