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<div class="moz-cite-prefix">On 07/13/2015 09:15 PM, wrote:<br>
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cite="mid:C40B2F181831EF44A88CD73525827803130FFFABCF@MERCERMAIL.MercerU.local"
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<div id="yui_3_16_0_1_1436835739832_2642">Dr. Pounds,</div>
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<div id="yui_3_16_0_1_1436835739832_2642" dir="ltr">I had a few
questions regarding the labs. On the concentration effects
one, how to we find initial concentration of [I-]? All I have
is the concentration of H2O2 which is .2001 M and N2S2O3 which
is .020 M that was given. Should the concentrations be the
same for all flasks? </div>
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The other concentrations were written on the autopipetters. But the
main one you need is the I- concentration. You should be able to
find it in the lab procedures.<br>
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cite="mid:C40B2F181831EF44A88CD73525827803130FFFABCF@MERCERMAIL.MercerU.local"
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<div id="yui_3_16_0_1_1436835739832_2642" dir="ltr">Part two
asks for initial concentration of H2O2 and im guessing that I
would fill in .2001 M and then the time in seconds it took for
the solution to turn blue. And then calculate </div>
<div id="yui_3_16_0_1_1436835739832_2642" dir="ltr">rate= -Delta
H2O2/Delta temp right?<br>
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No. The concentration needs to be the diluted concentration. All
of the volumes you used are found in the lab procedures. As far as
calculating the rate, I just sent out another e-mail that described
how to do that.<br>
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cite="mid:C40B2F181831EF44A88CD73525827803130FFFABCF@MERCERMAIL.MercerU.local"
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<div id="yui_3_16_0_1_1436835739832_2642" dir="ltr">For lab two,
the temperature effects one, we are given the KMnO4 has a
concentration of .0050 M, but how do we calculate the
concentration of MnO4-? After calculating that, we would fill
in temperatures starting from the room temp, all the way up to
50 degrees over the room temp all in kelvin, find the
difference in time and then just plug in my concetration and
change in temperature, correct?</div>
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Potassium permanganate is a strong electrolyte and completely
dissociates. The concentration of permanganate ion is thus equal to
the concentration of potassium permanganate. Fill out the temps as
you described and then calculate the rates as I described in the
previous e-mail. Then make me a pretty graph to determine the
activation energy.<br>
<br>
<pre class="moz-signature" cols="72">--
Andrew J. Pounds, Ph.D. (<a class="moz-txt-link-abbreviated" href="mailto:pounds@theochem.mercer.edu">pounds@theochem.mercer.edu</a>)
Professor of Chemistry and Computer Science
Mercer University, Macon, GA 31207 (478) 301-5627
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