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<div class="moz-cite-prefix">On 06/20/2016 06:40 PM, wrote:<br>
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cite="mid:c94ee2e62cd449b18438aa39ebcd5f0f@superman.MercerU.local"
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<div>Im confused about how to find the concentration. I’ve tried
the pre lab several times, but I’m still struggling. </div>
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<br>
You massed out an exact amount of nickel sulfate hexahydrate.
Divide this by the molar mass (which is found in the report
description) to find the moles. You then placed this in a 100 ml
volumetric flask and diluted to the mark. The concentration would
then be <br>
<br>
moles / volume where volume is 0.1000 L.<br>
<br>
<br>
The second flask used 20 ml of the solution you just made and
diluted it to 50 ml. So you use the standard dilution equation. <br>
<br>
<img style="vertical-align: middle"
src="cid:part1.05030303.04040803@mercer.edu" alt="$m_1v_1=m_2v_2$">
<br>
<br>
In other words the concentration of flask 2 (<img
style="vertical-align: middle"
src="cid:part2.02050405.03060102@mercer.edu" alt="$m_2$">) would
be<br>
<br>
<img style="vertical-align: middle"
src="cid:part3.02090908.04000907@mercer.edu"
alt="$\frac{m_1v_1}{v_2}$"><br>
<br>
where <img style="vertical-align: middle"
src="cid:part4.09040103.07070105@mercer.edu" alt="$m_1$"> is the
concentration in flask 1, <img style="vertical-align: middle"
src="cid:part5.09080903.09070302@mercer.edu" alt="$v_1$"> is
0.02000 L, and <img style="vertical-align: middle"
src="cid:part6.00060001.00050701@mercer.edu" alt="$v_2$"> is
0.05000 L. The other calculations are done in a similar manner.<br>
<br>
<br>
<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
Mercer University, Macon, GA 31207 (478) 301-5627
<a class="moz-txt-link-freetext" href="http://faculty.mercer.edu/pounds_aj">http://faculty.mercer.edu/pounds_aj</a>
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