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Carbonation sometimes occurs when carbon dioxide is dissolved in water or an aqueous solution. This process yields the "fizz" to carbonated water and sparkling mineral water, the head to beer, and the cork pop and bubbles to champagne and sparkling wine. It is also behind the Diet Coke and Mentos eruption effect.

Effervescence

Effervescence is the escape of gas from an aqueous solution. The term is used to describe the foaming or fizzing that results from a release of gas. In the lab, a common example of effervescence is the addition of hydrochloric acid 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 cork, 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:

${\mbox{H}}_{2}{\mbox{CO}}_{3}\longrightarrow {\mbox{H}}_{2}{\mbox{O}}+{\mbox{CO}}_{2}$

In simple terms, it is the result of the chemical reaction occurring in the liquid which produces a gaseous product.

Fizz

"Fizz" is a word that is used to describe the action or sound of gas bubbles moving through and escaping from a liquid. Fizz also describes the formation of a foam of this gas and liquid at the top of the liquid's container. The word itself is an example of onomatopoeia, derived from the sound the multiple bubbles make together as they "pop" when they escape. A carbonated beverage, such as cola or beer, will form bubbles when the dissolved carbon dioxide is depressurized to form emulsions at the top, and it will make "fizzing" sounds when it is opened or poured into a container. In the United Kingdom, soft drinks are often referred to as 'fizzy drinks'. A cocktail based on carbonated water and an acidic juice is called a Fizz, such as the Gin Fizz.

Fizz can also result from a chemical reaction, such as a solid dissolving in a liquid to produce gas. For example, Alka-Seltzer brand tablets, used to treat stomach indigestion, form an effervescent solution that fizzes when dropped into water. The essential chemical reaction is:

${\mbox{citric acid}}+{\mbox{sodium bicarbonate}}\longrightarrow {\mbox{water}}+{\mbox{carbon dioxide}}+{\mbox{sodium citrate}}$

${\mbox{C}}_{6}{\mbox{H}}_{8}{\mbox{O}}_{7}+{\mbox{3}}{\mbox{Na}}{\mbox{HC}}{\mbox{O}}_{3}\longrightarrow {\mbox{3}}{\mbox{H}}_{2}{\mbox{O}}+{\mbox{3}}{\mbox{CO}}_{2}+{\mbox{Na}}_{3}{\mbox{C}}_{6}{\mbox{H}}_{5}{\mbox{O}}_{7}$

Shaking

thumb This Premixed Soft drink Carbonation Tester is made of of tempered glass and stainless steel with a quick connect on the bottom, and a 100 psi gauge and relief valve on the top. Used in the 1960s to check the pressure of premixed soft drinks before shipping them off in 5 gallon tanks by truck, it is operated by connecting the tank to the quick connect, bleeding off gas to allow the glass to fill and then shaking it up. The pressure is then read from the gauge.

It is commonly said that shaking a carbonated beverage will cause large amounts of foam to erupt upon opening, and it is often believed that shaking a bottle containing a carbonated beverage will cause the pressure inside to rise. In fact, when a pressure gauge is attached to a pressurized bottle of a carbonated beverage, it is found that the pressure within does not increase. It is instead the formation of tiny bubbles from the agitation that causes the foam; upon opening, the size of the bubbles will rapidly increase due to the reduction in pressure, resulting in excessive foaming.

Agitating carbonated liquid in a resealed vessel increases the rate that CO₂ is released from the solution and the rate that it approaches equilibrium pressure. The equilibrium pressure depends on the temperature, composition, and purity of the liquid and is not affected by agitation.

Measuring carbonation

The quality of carbonated beverages including softdrinks, seltzer and beer is affected by the amount of dissolved CO2 (the gas that causes carbonation) and the amount of carbonic acid in the drink. Carbon dioxide (CO2) has an infrared absorption wavelength of 4.27um and can be measured online using an infrared carbonation sensor. This is an improvement to the traditional inferred measurement method using temperature and pressure for Henry's Law coefficients because this methodology is influenced by changes in density and alcohol content. Infrared measurements are not affected by changes in density or alcohol content because they are actually measuring the CO2 molecule using Beer Lamberts Law. The amount of carbonation in a beverage is measured in Volumes or grams/liter. This is because introducing CO2 into a beverage will change its weight. An easy experiment to prove this is to take a seltzer bottle and weigh it. Carefully remove the top slowly so no liquid escapes from the bottle as the gas escapes the weight of the bottle of seltzer will go down. Shaking the bottle closed and then opening it to remove more CO2 will increase this effect.

Natural and artificial carbonation

Carbonation can occur as a result of natural processes: when yeast ferments dissolved sugars sealed in a pressure-tolerant bottle or keg; when underground volcanic carbon dioxide carbonates well water; or when rainwater passes through limestone into a cave and forms a stalactite. Or it can be done artificially by dissolving carbon dioxide under pressure into the liquid. Sometimes natural carbonation is called conditioning while the term carbonation is reserved for the artificial process.

Uses

In many consumer beverages such as soft drinks (well known examples include Coca-Cola, 7 Up and Pepsi), carbonation is used to give "bite". Contrary to popular belief, the fizzy taste is caused by dilute carbonic acid inducing a slight burning sensation, and is not caused by the presence of bubbles. This can be shown by drinking a fizzy drink in a hyperbaric chamber at the same pressure as the beverage. This gives much the same taste, but the bubbles are completely absent.

Carbonation is sometimes used for reasons other than consumption for example: to lower the pH (raise the hydrogen ion concentration) of a water solution, and in the cleaning industry (Chem-Dry and Carbonated Solutions both use carbonated cleaning solutions for carpet cleaning)

Brewing

In homebrewing, overcarbonation can be dangerous; it can result in bottles gushing or even exploding. Adding priming sugar or malt extract at bottling time to beer that has had its fermentable sugar content totally consumed is the safest approach to carbonation. Exceeding recommended levels of priming sugar for a given recipe is dangerous, as is using inappropriate bottles or improper capping methods. Beer may also be force-carbonated using a keg and special bottling equipment so that the carbonation level can be carefully controlled.

References

Robert O'Leary. "ATR Infrared Spectroscopy method for measuring Carbonation in beverages" (PDF). {{cite web}}: Cite has empty unknown parameter: |(empty string)= (help) —O'Leary describes in detail the theory and practice of measuring dissolved CO2 content in softdrinks and beer.

External links

Carbonation and Acidity
From Velvety Foam to Rocky Head - Ray Daniels
Dissolution of Marble in Hydrochloric Acid Demonstration experiment: Instruction and video

@@ Line 3: / Line 3: @@
 [[Image:Soda bubbles macro.jpg|right|thumb|250px|Bubbles of carbon dioxide float to the surface of a [[soft drink]].]]
-'''Carbonation''' occurs when [[carbon dioxide]] is [[solvation|dissolved]] in [[water]] or an [[aqueous]] [[solution]]. This process yields the "'''fizz<!--REDIRECT-->'''" to [[carbonated water]] and sparkling [[mineral water]], the [[Beer head|head]] to [[beer]], and the cork pop and bubbles to [[Champagne (wine)|champagne]] and [[sparkling wine]]. It is also behind the [[Diet Coke and Mentos eruption]] effect.
+'''Carbonation''' sometimes occurs when [[carbon dioxide]] is [[solvation|dissolved]] in [[water]] or an [[aqueous]] [[solution]]. This process yields the "'''fizz<!--REDIRECT-->'''" to [[carbonated water]] and sparkling [[mineral water]], the [[Beer head|head]] to [[beer]], and the cork pop and bubbles to [[Champagne (wine)|champagne]] and [[sparkling wine]]. It is also behind the [[Diet Coke and Mentos eruption]] effect.
 ==Effervescence==