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<p><font face="serif">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 <a moz-do-not-send="true"
href="http://theochem.mercer.edu/chm112/aqueous_equil_1.pdf">example</a>
for the first solution as a guide. <br>
</font></p>
<p><font face="serif">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<sup>2+ </sup></font>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 <a moz-do-not-send="true"
href="http://theochem.mercer.edu/chm112/aqueous_equil_2.pdf">example</a>.
For EACH solution determine a value of the equilibrium constant
and then average them.</p>
<p>Let me know if you have any questions.<br>
</p>
<pre class="moz-signature" cols="72"> --
Andrew J. Pounds, Ph.D. (<a class="moz-txt-link-abbreviated" href="mailto:pounds_aj@mercer.edu">pounds_aj@mercer.edu</a>)
Professor of Chemistry and Computer Science
Director of the Computational Science Program
Mercer University, Macon, GA 31207 (478) 301-5627
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