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Author: Subject: My zinc oxide not pure, have carbonate, can ZnO absorb CO2?
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[*] posted on 3-9-2021 at 05:56
My zinc oxide not pure, have carbonate, can ZnO absorb CO2?


people gived 2 parts ZnO me, I tryed mix ZnO and sulphuric acid to make zinc sulphate, have bubles come out, 1 part out more bubles, other part out less bubles, so I guess ZnO have zinc carbonate, not pure, and 1 part have more zinc carbonate, other part less zinc carbonate, so I guess only 2 possibility, one is people made ZnCO3, then burned it but not yet burned finish, so had ZnCO3 left, other is people made ZnO, then ZnO absorbed CO2, like lime water, then which more possible?



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[*] posted on 3-9-2021 at 06:23


Both are possible.

Any really basic oxide can absorb CO2 from air. I have similar experience with CdO (a brown powder, which turned somewhat lighter on storage and now bubbles a little when added to acid).

ZnCO3, when heated insufficiently, or for a short time, certainly can have left-over carbonate in it.




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[*] posted on 14-9-2021 at 08:18


I have old (20+ years) pharmacy grade ZnO stored in a paper bag. So it could have absorbed CO2 from air if wanted. But did not. So I assume ZnO does not absorb CO2 from air or not readily for sure.
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[*] posted on 14-9-2021 at 09:58


I think it depends on whether the oxide reacts with water from the air to form hydroxide, which would absorb CO2.
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[*] posted on 14-9-2021 at 18:16


Might also be some sulphide contamination, did it smell like rotten eggs?



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