LAWRENCE MIGDALE / SCIENCE PHOTO LIBRARY LAWRENCE MIGDALE / SCIENCE PHOTO LIBRARY
Adding household vinegar (containing acetic acid) to a tube containing sodium bicarbonate (sodium hydrogen carbonate): the mixture reacts and gives off copious quantities of carbon dioxide. Because sodium bicarbonate is harmless in itself and undergoes this harmless reaction with acid, it is often used in the treatment of acid spillage and as a medicinal antacid.
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