A 355-milliliter can of Coke contains approximately 2.2 grams, or 0.355 liters, of carbon dioxide. The concentration value varies depending on the size of the container where the Coke is stored.
Carbon dioxide is a colorless and odorless gas that adds the sparkle and bubbles to beverages. It is used in coke as a mild preservative as well as a form of anti-microbiological agent. Carbon dioxide is a uniquely suitable gas in soft drinks because it is cheap, inert, non-toxic and easy to liquefy. Although it is deadly in highly concentrated amounts, it helps prevent microbes from growing inside of one's mouth in the small amounts in soft drinks. Carbon dioxide does not have documented negative effects on the gastrointestinal tract or general health.