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Thread: Just FYI - CO2 and Carbonic Acid

  1. #1 Just FYI - CO2 and Carbonic Acid 
    Reptile Dysfunction drowsy turtle's Avatar
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    Just a little aside...

    Carbon dioxide does not form a liquid, it sublimes (changes straight from solid to gas). So that you (WMcC) were using liquid carbon dioxide is unlikely.

    At −78.51 C or -109.3 F, carbon dioxide changes directly from a solid phase to a gaseous phase through sublimation, or from gaseous to solid through deposition. Solid carbon dioxide is normally called "dry ice", a generic trademark.

    Carbonic Acid is the dissolved form of CO2 - when it leaves the solution, it reacts with the hydrogen ions it produces (hence it is an acid) and becomes carbon dioxide once more.

    Carbonic acid

    Other names Carbon dioxide solution, dihydrogen carbonate (IUPAC)
    Identifiers
    CAS number 463-79-6
    SMILES
    [show]
    C(=O)(O)O
    ChemSpider ID 747
    Properties
    Molecular formula H2CO3
    Molar mass 62.03 g/mol
    Density 1.0 g/cm3 (dilute soln.)
    Melting point

    n/a
    Solubility in water exists only in solution
    Acidity (pKa) see text
    10.25
    Except where noted otherwise, data are given for
    materials in their standard state
    (at 25 C, 100 kPa)
    Infobox references


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  3. #2 Re: Just FYI - CO2 and Carbonic Acid 
    Moderator Moderator TheBiologista's Avatar
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    I already closed this discussion. If we're ready to talk about evidence, I'll keep this one open. Last one just ended up being me and William.

    Quote Originally Posted by drowsy turtle
    Just a little aside...

    Carbon dioxide does not form a liquid, it sublimes (changes straight from solid to gas). So that you (WMcC) were using liquid carbon dioxide is unlikely.
    To give him his due, William was implying that he was using pressurised CO2, which could be in liquid form at least while under pressure. Having never used a liquid CO2 cannister, I don't know how long that liquid would last on escaping its container.

    Quote Originally Posted by drowsy turtle
    Carbonic Acid is the dissolved form of CO2 - when it leaves the solution, it reacts with the hydrogen ions it produces (hence it is an acid) and becomes carbon dioxide once more.
    Yes, pretty sure this is true. Open to evidence to the contrary though.


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  4. #3  
    Forum Ph.D.
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    sure its a liquid ---at 1800 psi-- they are called CO2 fire extingushiers.
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