[CHM 111] Chm 111-

[Andrew J. Pounds]

Careful... HPO$_4^{2-}$ is the polyatomic ion hydrogen phosphate.  In 
the case of KH$_2$PO$_4$ the hydrogen is not part of the polyatomic ion 
so you have to specify it explicitly.


On 09/13/2017 04:57 PM,  wrote:
> Dr. Pounds,
> As I review problem # 2.61 in the book, I come across the problem “name the following compounds a) KH(2 this is on bottom)PO(4)
> B) K(2)HPO(4) . Okay. So the first answer is Potassium Di Hydrogen Phosphate and the second answer is just Potassium Hydrogen Phosphate. If Hydrogen is part of the 7 dimolecular elements, why are we specifying it has 2 in A, and it has one in B without making it known? When we just say Potassium Hydrogen Phosphate, I know we have to get the cations to equal 3 to cancel the negative 3 out on the phosphate, but How do we know the Potassium is the one that gets the extra without specifying. Because Hydrogen is always supposed to have 2.
> This is a mess. I really hope you can follow my question.
>
> I hope you’re no longer in the dark, and I will see you tomorrow!


-- 
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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://theochem.mercer.edu/pipermail/chm111/attachments/20170913/84d6ee55/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: pmkhiodimnbfffhk.png
Type: image/png
Size: 553 bytes
Desc: not available
URL: <http://theochem.mercer.edu/pipermail/chm111/attachments/20170913/84d6ee55/attachment.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: nhoklhcpalljmjca.png
Type: image/png
Size: 462 bytes
Desc: not available
URL: <http://theochem.mercer.edu/pipermail/chm111/attachments/20170913/84d6ee55/attachment-0001.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: fhbmoeofnhpjjfif.png
Type: image/png
Size: 461 bytes
Desc: not available
URL: <http://theochem.mercer.edu/pipermail/chm111/attachments/20170913/84d6ee55/attachment-0002.png>