[CHM 112] Lab Questions

[Andrew J. Pounds]

On 06/29/13 10:59,wrote:
> I was wondering what trial 1 and trial 2 and average means on the 
> freeze depression lab? Is it talking about the average Temp on trial 1 
> and trial 2 and take average of those?
>
> Sent from my iPhone
>


 From the Lab descriptions you should have done SIX cooling curves 
resulting in six freezing point determinations.

1. Pure Solvent - first time  (Trial 1)
2. Pure Solvent - second time (Trial 2)

Average these to get the freezing point of the pure solvent.

3. Pure Solvent and ~3 g of solute - first time (Trial 1)
4. Pure Solvent and ~3 g of solute - second time (Trial 2)

Average these to get the freezing point of the solvent with ~3 grams of 
solute added

5. Pure Solvent and ~6 g of solute - first time (Trial 1)
6. Pure Solvent and ~6 g of solute - second time (Trial 2)

Average these to get the freezing point of the solvent with ~6 grams of 
solute added


Theoretically the molar mass you determine for the 3 grams of solute and 
the 6 grams of solute should be the same.


-- 
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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