i've always wondered this, as we consume a huge amount of carbonated drinks, but have never managed to find out were the actual co2 comes from that is added to it.
asked Jun 14 '10 at 13:40
co2 is the best dissolvable gas in water that isn't toxic in those amounts
it comes from the exhaust gasses from factories, of course it's cleaned so there aren't any dangerous things in it anymore
answered Jun 14 '10 at 13:52
To produce carbonated water solution, the soda companies use pressurized carbon dioxide (CO2). The pressurized CO2 is passed though the water, making more CO2 dissolve into the water. This is possible because the pressure increases the solubility of CO2, thus putting more the CO2 in the water than would be possible in the normal atmospheric pressure.
It seems right. I remember watching something like How It's Made.
answered Jun 14 '10 at 13:54