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"Morten" wrote in message ... "Elaine T" wrote in message m... HCl fumes badly in concentrated form, and I think I remember some fumes from dilute HCl (haven't handled the stuff in a while). Same with acetic acid for that matter. Wouldn't you tend to acidify the fishtank some with acid fumes, or are they not concentrated enough to matter? HCl does indeed fume a bit and so does the Acetic Acid (Vinegar), but the acid is inside the ballon / drip bag inside the first container, and the only way out of there is via ahose leading to the main reactor where it gets neutralized / reacts with the baking powder and because you only draw off the gas you should be fine. If you're to worried you could send the CO2 gas through a bubble counter / water scrubber, that will take care of any stray HCl / Acetic Acid molecules that might be in gas form inside the main reactor. So in fact there will be 4 containers, one which is open at the top with water in it with a hose comming out of the bottom, the hose leads to the acid in ballon container on the outside of the ballon, the hose from the ballon goes through the bottom of the acid container and leads to the main reactor which also contains the baking powder solution. From the main reactor a small hose goes through a smaller container filled 2/3 with water so that the co2 has to bubble through the water and out via another hose above the water level and into tank diffuser / co2 reactor / valve / whatever... Or you could bubble through a concentrated solution of NaOH which does not fume and would last a lot longer than a pure water bubbler. A flask full of NaOH pellets backed by some MgSO4 pebbles (to remove moisture from the gas before it contacted the NaOH, which is hygroscopic) would also work. |
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