Why does Soda Pop go flat after a while?!
Why does Soda Pop go flat after a while?
Answers:
The gas (CO2) evolves from it.
This occurs when the pressure is no longer holding it into sloution as when the can is sealed. Also it gas will evolve from solution faster as the temperature of the liquid increases.
The warmer the soda is the faster it goes flat.
In a opened large 2 litre bottle (recapped) the gas evolves into the space (head space) between the cap and liquid level. The gas will continue to come out of the soda until it causes a pressure in the head space that prevents more gas from evolving out. Each time we open the bottle we lose the gas from the head space. When we close it the same process is repeated until the soda finally has no gas. It is then flat.