Effervescence

Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from that release.

[1] The word effervescence is derived from the Latin verb fervere (to boil), preceded by the adverb ex.

[2] In the laboratory, a common example of effervescence is seen if hydrochloric acid is added to a block of limestone.

If a few pieces of marble or an antacid tablet are put in hydrochloric acid in a test tube fitted with a bung, effervescence of carbon dioxide can be witnessed.

This process is generally represented by the following reaction, where a pressurized dilute solution of carbonic acid in water releases gaseous carbon dioxide at decompression: In simple terms, it is the result of the chemical reaction occurring in the liquid which produces a gaseous product.