foundmyreddit

foundmyreddit t1_iwtbqbg wrote

I’m surprised no one has answered yet. Carbonation in soda is caused by the liquid being saturated in carbon dioxide gas. If the liquid freezes into a solid ice matrix then the gas will no longer be dissolved (solubility decreases as the liquid gets colder, and eventually once it becomes ice there’s no way for a gas to stay dissolved in a solid) and your soda will go flat.

I think this was the essence of your question — but it does get more complicated if you assume the container remains a closed system (ie the soda freezes but the bottle doesn’t explode). Then the gas will separate from the soda when it freezes but will stay trapped in the bottle. Once the soda is thawed back into a liquid, some of the trapped gas will likely go back into solution, but it’s unlikely it’ll be as carbonated as before freezing

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