[CHM 111] Lab 7

[Andrew J. Pounds]

On 11/7/20 2:55 PM, Nancy Flores wrote:
> Good Afternoon Dr. Pounds,
>
> I am currently working on the lab and I had a few questions for some calculations. How do I find mass of pure KHP ?


>  I know that in our notebooks we wrote down the mass of impure KHP I'm not sure how to find pure KHP. To find moles of pure KHP will we use the mass of pure KHP? To find deviation will we use the molarity of the NaOH that we used and I’m not sure what other value we would use. 
>
> Thank you !
>
> Sent from my iPhone

Using the values for the NaOH concentration from the carboy from which
you retrieved solution, and the volume of NaOH you used in the
titrations, you use the equation

moles = (molarity) x (volume)

to find the moles of NaOH used.  The KHP and the NaOH react on a 1:1
basis, so the moles of KHP is equal to the moles of NaOH.  Once you find
the moles of KHP, multiply the moles by the molar mass to get the mass
of pure KHP.



-- 
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