|MadSci Network: Chemistry|
Good question! Carbon dioxide is the gas that coined the term 'carbonation'. When present in water, CO2 reacts with water to form carbonic acid - granted a very weak solution, but it happens. The carbonic acid changes the pH of the solution and alters our taste perception of the water or soda or whatever it was in in the first place. Think about it - mineral water and soda water do not taste the same as tap water or other non-gaseous (still) waters. While there are probably some mineral content differences that impact the taste, the big distinction is the presence of the carbonation. So, thanks for the question and enjoy your soda! Kieran
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