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Had to sit with it for a while before venturing a comment. The problem with a color-change, pH-based indicator is that it's a cumulative indicator rather than "snapshot" indicator. The longer you bubble a CO2-containing mixture through the solution the more acidic it becomes and the more pronounced the color-change. And, unfortunately, bubbling a non-CO2-containing mixture through doesn't reverse the reaction. So, what you're left with is an indication of how much has passed through semi-volumetrically but not how much is *currently* in the mixture. You may also encounter solubility limits depending on the temperature and pressure.
Don't get me wrong. I'm not saying that it can't be done, merely that you'll need to take this into consideration in whatever incarnation your design takes.
Warm Regards
Shawn
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"Call nothing thy own except thy soul. Love not what thou art, but only what thou may become. Do not pursue pleasure, for thou may have the misfortune to overtake it... Live in the vision of that one for whom great deeds are done ..." Man of LaMancha, D. Wasserman |