[CHM 111] Lab Question

[Andrew J. Pounds]

On 06/20/2016 06:40 PM,  wrote:
> Im confused about how to find the concentration. I’ve tried the pre 
> lab several times, but I’m still struggling.
>
>

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

moles / volume where volume is 0.1000 L.


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.

$m_1v_1=m_2v_2$

In other words the concentration of flask 2 ($m_2$) would be

$\frac{m_1v_1}{v_2}$

where $m_1$ is the concentration in flask 1, $v_1$ is 0.02000 L, and 
$v_2$ is 0.05000 L.  The other calculations are done in a similar manner.


-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj

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