Effervescence
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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. It has the same linguistic root as the word fermentation[2] .[citation needed]
Effervescence can also be observed when opening a bottle of champagne, beer or carbonated soft drink. The visible bubbles are produced by the escape from solution of the dissolved gas (which itself is not visible while dissolved in the liquid).
In beverages
Template:Further information Although CO2 is most common for beverages, nitrogen gas is sometimes deliberately added to certain beers. The smaller bubble size creates a smoother beer head. Due to the poor solubility of nitrogen in beer, kegs or widgets are used for this.[3]
Chemistry
Template:Main article 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.
- Page Module:Chem2/styles.css has no content.CaCO3 + 2 HCl → CaCl2 + H2O + CO2↑
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:
- Page Module:Chem2/styles.css has no content.H2CO3 → H2O + CO2↑
In simple terms, it is the result of the chemical reaction occurring in the liquid which produces a gaseous product.[4]
See also
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- Cavitation
- Carbonation
- Effervescent tablet
- Precipitation (chemistry), the "down-arrow"
References
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- ^ Page Module:Citation/CS1/styles.css has no content."Effervescence". Archived from the original on 2007-06-09. Retrieved 2010-04-14.
- ^ Page Module:Citation/CS1/styles.css has no content."Fermentation - Etymology, Origin & Meaning". etymonline.
- ^ Page Module:Citation/CS1/styles.css has no content.Baxter, E. Denise; Hughes, Paul S. (2001). Beer: Quality, Safety and Nutritional Aspects. Royal Society of Chemistry. p. 22. ISBN 9780854045884.
nitrogen gas beer
- ^ G. Liger-Belair et al., "Study of Effervescence in a Glass of Champagne: Frequencies of Bubble Formation, Growth Rates, and Velocities of Rising Bubbles", Am. J. Enol. Vitic. 50:3 (1999), 317–323.
