[CHM 111] Finding Pure KHP

[Andrew J. Pounds]

On 6/8/21 5:43 PM,  wrote:
> Good evening Dr. Pounds, 
> I’m having a hard time finding the pure KHP. I first started using the
> mass of the impure KHP and divided it by the molar mass of KHP given
> to us from the last lab then I realized the amount we weighed out is
> the impure and I can’t find in the notes how to find pure KHP. Do you
> know where I could find an equation or could you tell me the equation
> to find pure KHP? Thank you
>
> Get Outlook for iOS <https://aka.ms/o0ukef>

To find the moles of KHP you simply have to find the moles of NaOH --
remember, KHP is an acid that reacts with NaOH on a 1:1 basis.  So, in
today's experiment you determined the moles of KHP in your unknown by
reacting the unknown with NaOH.  It is assumed that the other "stuff" in
the unknown was non-reactive.

moles KHP = (volume of NaOH) (Molarith of NaOH)

Once you know the moles of KHP multiply it by the molar mass of KHP to
get the mass of KHP in your unknown sample.  Divide that number by the
total mass of the unknown sample and multiply by 100 to find the %KHP in
your sample.

Let me know if you have other questions.

-- 
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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