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Topic: nomenclature  (Read 7502 times)

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pokinatcha

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nomenclature
« on: February 15, 2006, 12:10:36 PM »
I am having trouble with a couple of nomenclature problems.  
1st: IUPAC name for MoO3

I have tried Molybdenum Oxide, molybdenum trioxide, molybdenum (I) trioxide and molybdenum (I) oxide.  I don't even know what else it could be.

Also,  the correct molecular compound for barium hydroxide.  I have tried BaOH, BaOH-

In my class notes, hydroxide is OH-, so I really don't know what I am doing wrong in trying to put them together.  Thanks in advance for any help.  
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Offline Albert

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Re:nomenclature
« Reply #1 on: February 15, 2006, 12:26:32 PM »
Quote from: pokinatcha on February 15, 2006, 12:10:36 PM
I am having trouble with a couple of nomenclature problems.  
1st: IUPAC name for MoO3

I have tried Molybdenum Oxide, molybdenum trioxide, molybdenum (I) trioxide and molybdenum (I) oxide.  I don't even know what else it could be.

Best IUPAC name is Molybdenum (VI) Oxide: very formal, isn't it? :D

For what concerns barium hydroxide: barium is in the second group of the table, so, how many charges has its ion?
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Offline Alberto_Kravina

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Re:nomenclature
« Reply #2 on: February 15, 2006, 12:32:15 PM »
Quote
Also,  the correct molecular compound for barium hydroxide.  I have tried BaOH, BaOH-
Also remember that Barium hydroxide is a neutral molecule so it hasn't any charge. :)
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pokinatcha

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Re:nomenclature
« Reply #3 on: February 15, 2006, 01:15:51 PM »
 :-\Why Molybdenum (VI) Oxide?  I don't understand where the VI comes from.  I am totally clueless in this area.  I swear all my correct answers were pure luck!!!
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Offline Albert

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Re:nomenclature
« Reply #4 on: February 15, 2006, 01:26:03 PM »
(VI) doesn't stand for the number of atoms, but is the valence number of molybdenum: http://en.wikipedia.org/wiki/Valence_number

What about barium hydroxide?
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pokinatcha

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Re:nomenclature
« Reply #5 on: February 15, 2006, 01:45:03 PM »
Yes, thank you, that light went on in my head right before i read your post  ;)

So then, since barium ion is Ba2+, and hydroxide is OH-, the charge cancels and it would be Ba2OH?  Oh.... I hope I am right!!  
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Offline Alberto_Kravina

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Re:nomenclature
« Reply #6 on: February 15, 2006, 01:47:14 PM »
Quote
So then, since barium ion is Ba2+, and hydroxide is OH-, the charge cancels and it would be Ba2OH?  Oh.... I hope I am right!!  

No. Ba is +2 and OH is -1! So you have to make a neutral molecule out of this ions. Just make sure that the overall carge is 0
« Last Edit: February 15, 2006, 01:48:13 PM by Alberto_Kravina »
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pokinatcha

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Re:nomenclature
« Reply #7 on: February 15, 2006, 01:58:51 PM »
 ::)Than, let's see.  I would then need 2 anions to neutralize Ba, and 1 cation for the hydroxide?  Ba(OH)2?

Sorry.....I swear I will get it one of these times!
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Offline Albert

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Re:nomenclature
« Reply #8 on: February 15, 2006, 02:09:12 PM »
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pokinatcha

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Re:nomenclature
« Reply #9 on: February 15, 2006, 02:15:57 PM »
 :DSWEET!!!!  Thank you for your help.  Seriously I don't know why things can't be explained that way in class.

You ROCK!
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