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Thread: insight into the formation of Carbonic Acid please.

  1. #1 insight into the formation of Carbonic Acid please. 
    Forum Freshman
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    So the formula stands as the following CO2+H2O >>>> H2CO3


    Can you please explain how the H2 and CO3 came about.


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  3. #2 Re: insight into the formation of Carbonic Acid please. 
    Forum Professor leohopkins's Avatar
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    Quote Originally Posted by chrisman10
    So the formula stands as the following CO2+H2O >>>> H2CO3


    Can you please explain how the H2 and CO3 came about.
    Well think about it, you have 2 hydrogen atoms in H2O. (2 hydrogen atoms = H2)
    You have 1 carbon catom in CO2 (one carbon arom = C)

    You have 1 oxygen atom in H2O (one oxygen atom = C0
    You have 2 oxygen aroms in CO2 (two oxygen atoms = C2)

    The above three oxygen atoms = O3
    Amount of carbon atoms is still 1, so we now have CO3
    Amount of hydrogen aroms is still 2, so we now have H2CO3

    I hope that makes sense?


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  4. #3  
    Reptile Dysfunction drowsy turtle's Avatar
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    I did try to find a diagram showing the whole reaction, but I couldn't find one, so...

    In the reaction, the water molecule acts as a nucleophile, as the partially negative oxygen atom in the water molecule attacks the partially positive carbon atom. The result of this interaction is a bicarbonate ion and a free hydrogen ion.

    The carbonic acid is formed when the hydrogen ion bonds to the bicarbonate ion.
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  5. #4  
    Forum Cosmic Wizard i_feel_tiredsleepy's Avatar
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    Water would dissociate into H+ and OH- in small amounts.

    H+ H-O: + O=C=O > H-O-C(=O)-O: <-H+

    There's a nucleophilic attack by the hydroxide onto the C, which has a partial positive charge. One pair of electrons from one of the double bonds has to move onto the Oxygen, giving it a negative charge, which causes it to react with a free hydrogen.

    Then you get H2CO3

    Edit: which is exactly what Drowsy said, but in a bit more detail.
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