[CHM 112] Burdge Problem

[Andrew J. Pounds]

On 04/21/2015 07:10 PM,  wrote:
>
> Could you please explain problem 16.136? How do we find the initial 
> reaction where phosphorous is burned with oxygen?
>
> Thank you!!
>

The first two equations on the answer page are the reactions for the 
burning of white phosphorous and how white phosphorous reacts with water 
to form phosphoric acid.  Via the stoichometry, 10.0 g of P4 creates 
0.323 moles of phosphoric acid.  This is in 500 ml, so the concentration 
is doubled to 0.646 M.

The rest of the problem is just like your notes for diprotic acids. I 
calculated H+ for the first equlibration and then the H+ for the second 
equilibration and added them together.  Since the H+ from the second 
equilibration was negligible, I could calculate the pH from the 0.066 M 
value.




-- 
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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