Homework Help: dr bob

Posted by sam on Friday, December 14, 2007 at 12:57pm.

I am still confused by the last one CO3^2-

You were nice enough to do a diagram and then the expalnation for what else I needed to do was so confusing - I am at study hall and this is my last one

dr bob - DrBob222, Friday, December 14, 2007 at 3:05pm
You have 24 electrons.
O
|
C=O
|
O
For every dash in the diagram above place two electrons. Around the top O place three sets of two electrons (3 pairs)l Same thing for bottom O. For middle O, place two more pairs. Count the electrons. You should have 24. Now show a 2- charge on the entire ion.
- dr bob - sam, Friday, December 14, 2007 at 3:21pm
  I am just not getting this one is it possible to make the drawing if it HELP
dr bob - DrBob222, Friday, December 14, 2007 at 3:27pm
What's the problem? Just not getting doesn't help me much. I've done it two ways and you are still having problem. Do you not understand why we have 24 electrons? Do you not understand why we have 4 bonds? Just what is it you don't get? Be specific. Be detailed. Don't leave out anything.
- dr bob - sam, Friday, December 14, 2007 at 3:32pm
  I cant seem to get the diagram right on this one - I am sorry
  - dr bob - DrBob222, Friday, December 14, 2007 at 3:43pm
    What's not right about the diagram? How do you know it isn't right?
    - dr bob - sam, Friday, December 14, 2007 at 3:44pm
      where does the 2- go
      - dr bob - DrBob222, Friday, December 14, 2007 at 3:52pm
        The 2- is just the charge on the carbonate ion (CO3^2-). So you can put large parentheses around the diagram [left and right-- like this--(diagram)] and put the 2- at the upper right of the right hand parenthesis. Some people don't even put the parenthese--they just place a 2- in the upper part of the diagram but off a little to one side. Like this
        O
        |
        C=O
        |
        O
        
        dr bob - DrBob222, Friday, December 14, 2007 at 3:54pm
        The 2- didn't print. Let me try again.
        O 2-
        |
        C=O
        |
        O
        
        dr bob - sam, Friday, December 14, 2007 at 4:18pm
        so it is not nec for the parenthesis
        
        dr bob - DrBob222, Friday, December 14, 2007 at 4:24pm
        Not really. I think it makes it neater because the 2- isn't just sticking out there. However, I've seen it done both ways.
        
        dr bob - sam, Friday, December 14, 2007 at 4:35pm
        you are very generous with your time thanks sam
        
        dr bob - DrBob222, Friday, December 14, 2007 at 4:53pm
        You're most welcome. Keep posting.

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