Reaction of acids with carbonates
In this reaction setup, lime water is poured into one of the test tubes and sealed with a stopper. A small amount of hydrochloric acid is carefully poured into the remaining test tube. A small amount of sodium carbonate is added to the acid, and the tube is sealed with a rubber stopper. The two tubes are connected. As a result of the acid-carbonate reaction, carbon dioxide is produced and the lime water turns milky.
Source
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"Free High School Science Texts Project, Types of Reactions: Acid-Base Reactions. September 30, 2012."
http://cnx.org/content/m39088/latest/
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