If a bottle of carbonated soft drink is left open, the taste of the soft drinks goes "flat". Why? Explain how.?

from the word "carbonated" it means that CO2 was added in the soft drink mixture to give you the bubbling refreshing sensation when you drink SD, keeping it open allows the Co2 to escape given that the pressure is lesser than the P of close bottle.

When soda is bottled at the plant, it is saturated with carbon dioxide (CO2). It is also held under tremendous pressure so that it can absorb more CO2 (Ideal Gas Law, Boyle's Law). When you open it, suddenly, the pressure equilibrates with the atmosphere. Then, the amount of CO2 in the bottle will be around the same as the amount of CO2 in the air around it. Therefore, this reaction is not reversible unless you force CO2 into the bottle under high pressure.

The reaction of CO2(gas state) <===> CO2(aqueous state) is an equilibrium reaction. Hence this reaction is reversible.

When left open, it is exposed to warm air. Since gas CO2 to aqueous CO2 is a exothermic reaction, the rise in temperature promotes a backwards reaction.

So most of the aqueous CO2 escapes as gas CO2.

To get the fizz back, you can put the drink and the CO2 in a sealed container. Cooling it will make the CO2(gas) go back to an aqueous phase.

Also, if you're in Antarctica, you can leave a coke bottle open for as long as you want and it won't lose its kick!

maximum rapid foodstuff places, to boot as maximum places that have "fountain" drink machines, use what's noted as a bag in a field. The syrup combination is in a bag interior a field and that they hook it as much as a hose. The hose is linked to carbon & water and whilst the button is pushed, that combination is released. If the area has the carbon/water combination incorrect, then particular it will be distinctive, besides the undeniable fact that it has not something to do with it being mixed with different stuff. The coke you purchase in a backside on the save is comparable to what you will possibly get at McDonald's.

The drink has "fizz" because CO2 has been dissolved into it. It is "super-saturated" with it.

A similar way to demonstrate this phenomenon is to fill a glass with cold water (no ice) and set it on the counter. As it warms, you will notice that bubbles form on the side of the glass. These are oxygen bubbles. A warm glass of water holds less oxygen than a cool glass of water.