[CHM 111] KHP Standardization Calculations

[Andrew J. Pounds]

Here is some assistance for the lab.  It would be helpful if you
calculated the molarity of NaOH for each of your "good" trials from lab
today.

The molar mass of KHP is 204.22 g/mol, so to calculate the molarity of
the NaOH

$\mathrm{\frac{\frac{(mass\ of\ KHP)}{204.22}}{(volume\ of\ NaOH)}}$


where all of your volumes are in liters and your masses in grams.


Now, once you have calculated the molarities (to four significant
figures), select the THREE molarities from todays lab that have the best
precision.  Circle these in your lab notebook and on your report form.  
Compute the average molarity for your NaOH using the THREE molarities
that have the best precision.

For example,   if in lab I had the following results...

0.1301

0.1289

0.1296

0.1240

0.1304

I would use 0.1296, 0.1301, and 0.1304 (Average Deviation:  0.0003) and
come up with an average of 0.1300.

Let me know if you have questions about this.



-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Director of the Computational Science Program
Mercer University,  Macon, GA 31207   (478) 301-5627

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