Grade 12Physical Chemistry
When a soft drink bottle is opened, CO2 comes out. This change is classified as reversible or irreversible?
When a soft drink bottle is opened, CO2 comes out. This change is classified as reversible or irreversible?
1 Answer
Ramesh V
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!
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