Which beverage type is characterized by containing carbonic acid as the only acid component, without added flavorings or preservatives?
Answer
Plain seltzer or club soda
Plain carbonated water, known as seltzer water or club soda, represents the most straightforward example of a drink containing only carbonic acid. This specific state occurs because the beverage is created simply by injecting carbon dioxide into chilled water, without the addition of other acidifying agents like phosphoric or citric acid used for flavor enhancement or preservation. While tonic waters and standard soft drinks are carbonated and therefore contain carbonic acid, their overall acidity is dominated by these intentionally added, stronger acids, meaning they do not meet the criterion of having *only* carbonic acid present as the acidifying entity.

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