00:01
To determine the concentration of the mercury at equilibrium, we recognize that the formation reaction of the complex ion is hg2 plus plus 4 iodides go to hgi42 minus, where kf is equal to the concentration of the complex ion at equilibrium, divided by the concentration of mercury in the iodide concentration squared.
00:27
They give us that value at 7 .65 times 10 to the 25th.
00:33
With such a large value, we can assume that mercury, having the lowest concentration, is the limiting reactant, and it is essentially consumed completely.
00:44
So all of the mercury concentration becomes the complex ion concentration, and the complex ion concentration is then 0 .010 molar.
00:55
The iodide concentration starts out at 0 .78 molar.
01:01
If we subtract off four times the concentration of the complex ion formed, recognizing four iodides are consumed for every complex ion, we'll have the remaining iodide concentration 0 .74 molar...