[CHM 112] Aqueous Equilibrium Calculations - Part II

[Andrew J. Pounds]

So AFTER you have built your standardization plot with the best fit
line, you are in a position to equilibration part of the lab.  For each
solution compute the initial concentrations using my example
<http://theochem.mercer.edu/chm112/aqueous_equil_1.pdf> for the first
solution as a guide.  

Once you have calculated all of your initial concentrations you can then
proceed to the next part.   In the lab the absorbance of each curvette
was measured -- thus measuring the absorbance of FeSCN^2+  for each
tube.  Your calibration plot (or rather your best fit line from your
calibration plot) lets you convert these absorbances back into
concentrations.  For EACH solution, you need to determine the
equilibrium concentrations of all of the species.  This is done via an
ICE table as shown in my second example
<http://theochem.mercer.edu/chm112/aqueous_equil_2.pdf>.   For EACH
solution determine a value of the equilibrium constant and then average
them.

Let me know if you have any questions.

 -- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Director of the Computational Science Program
Mercer University,  Macon, GA 31207   (478) 301-5627

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