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Posted by 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 - , 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 - , 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 - , 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 - , Friday, December 14, 2007 at 3:32pm

    I cant seem to get the diagram right on this one - I am sorry

  • dr bob - , Friday, December 14, 2007 at 3:43pm

    What's not right about the diagram? How do you know it isn't right?

  • dr bob - , Friday, December 14, 2007 at 3:44pm

    where does the 2- go

  • dr bob - , 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 - , Friday, December 14, 2007 at 3:54pm

    The 2- didn't print. Let me try again.
    O    2-
    |
    C=O
    |
    O

  • dr bob - , Friday, December 14, 2007 at 4:18pm

    so it is not nec for the parenthesis

  • dr bob - , 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 - , Friday, December 14, 2007 at 4:35pm

    you are very generous with your time thanks sam

  • dr bob - , Friday, December 14, 2007 at 4:53pm

    You're most welcome. Keep posting.

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