You may associate carbonation with dehydration, but more likely - the beverage is caffeinated, and the caffein is a diuretic, so may dehydrate you. I am thus not answering about carbonation per se, but about its common companion, Caffeine, and its effect. I welcome more comments.
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Carbonated water does not dehydrate you. Caffeine (found in alot carbonated soda drinks) dehydrates, but not carbonated water. On the other hand, drinking carbonated water can make the body feel more full, because it contains carbonic acid.