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Topic: Nomenclature  (Read 5912 times)

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Offline Mikez

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Nomenclature
« on: March 13, 2007, 07:14:01 PM »
I just have 3 questions:

1. How do I name: Sb2S3

Do I name this like a covalent bond (di and tri) since Sb has a charge of 3-? or
like a ionic bond since sb is a metal?

2.  CuMnO4

attempt: copper (II) manganese (IV) oxide - this  doesn't add up and doesn't look right...

3. How do I write the formula for arsenious phosphite? (the main problem is that I have no idea what arsenious is, arsenic only has 1 charge)


EDIT: also do I name O2 as dioxide or just oxygen?


thanks

Offline justin122289

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Re: Nomenclature
« Reply #1 on: March 13, 2007, 08:15:20 PM »
Hmm...don't quote me on the first one, but I'm pretty sure you would use the bi- and tri- prefixes since both are nonmetals.

The second one, CuMnO4 is Copper (I) Permanganate. MnO4 is the polyatomic ion with a charge of -1, so Copper must have a charge of -1 to balance that out.

The arsenic one I have no idea.

And finally, the O2 molecule is usually just referred to as oxygen gas unless it is part of a larger compound.
Hope this helps!
Z Atomic Number is Z number of protons in Z nucleus of Z atom

Offline Borek

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Re: Nomenclature
« Reply #2 on: March 14, 2007, 04:02:41 AM »
The second one, CuMnO4 is Copper (I) Permanganate. MnO4 is the polyatomic ion with a charge of -1, so Copper must have a charge of -1 to balance that out.

Why not copper (II) manganate?
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Offline Dan

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Re: Nomenclature
« Reply #3 on: March 14, 2007, 04:22:51 AM »
Agreed. Permanganate will oxidise Cu(I).
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Offline justin122289

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Re: Nomenclature
« Reply #4 on: March 14, 2007, 04:47:52 PM »


Why not copper (II) manganate?

Wouldn't copper (II) permanganate be Cu(MnO4)2  ?
Z Atomic Number is Z number of protons in Z nucleus of Z atom

Offline DevaDevil

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Re: Nomenclature
« Reply #5 on: March 14, 2007, 05:10:19 PM »
permanganate: MnO4-
manganate MnO42-

both are in principle possible judging from the formula; but copper(II)manganate is ALOT more stable (as Dan said, permanganate - a strong oxidiser - will oxidise Cu+ to Cu2+ fast)

Offline Borek

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Re: Nomenclature
« Reply #6 on: March 14, 2007, 05:27:31 PM »
This is an interesting case of isomerism :)
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Offline DevaDevil

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Re: Nomenclature
« Reply #7 on: March 14, 2007, 05:29:11 PM »
This is an interesting case of isomerism :)

indeed it is :)

Offline justin122289

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Re: Nomenclature
« Reply #8 on: March 14, 2007, 10:05:59 PM »
permanganate: MnO4-
manganate MnO42-

both are in principle possible judging from the formula; but copper(II)manganate is ALOT more stable (as Dan said, permanganate - a strong oxidiser - will oxidise Cu+ to Cu2+ fast)

Ohh okay I didn't know that MnO4 had another charge.
Z Atomic Number is Z number of protons in Z nucleus of Z atom

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