Dissolved carbon dioxide turns into carbonic acid, which is why soda is so bad for your teeth. Drinking diet soda doesn't help because it also contains this acid. When you take the top off of a bottle of soda, the pressure inside the bottle decreases and goes to the same pressure as the atmosphere. When that happens the carbon dioxide inside is no longer forced to be a liquid and turns back into a gas, causing the bubbles that we're so familiar with. If a soda sits out for a long time eventually all of the carbon dioxide will turn to gas and leave the soda flat.
If you look closely, you'll notice that most of the bubbles in a soda are at the top, the surface that's open to the air, that's why it takes so long for a soda to go flat. Cans of carbonated soft drinks contain carbon dioxide under pressure so that the gas dissolves in the liquid drink.
Once the the can is opened, all of the gas will eventually escape from the liquid as bubbles, and the soda will go "flat. If the can is shaken, however, or if the liquid is poured quickly into a glass, then the bubbles formed by turbulence provide an easier way for the dissolved gas to escape. It's difficult for the gas to escape from an undisturbed liquid because of the liquid's surface tension, which is the energy required to separate the liquid molecules from one another as a bubble forms.
For a tiny bubble just getting started, the amount of energy required per molecule of gas in the bubble is relatively large. So getting started is the difficult stage. By the way, unopened soda can go flat as well if it is left out long enough.
If it is not stored in a cold place, then soda can go flat within a matter of days! However, keeping it in the refrigerator prevents your favorite sodas from going flat. You probably ran away, giggling, when they were chasing after you covered in it! When a can or bottle of soda is unopened, there is an equilibrium between that is dissolved carbon in the tap water — potassium bicarbonate mixture and the carbon gas floating at the top of the can or bottle.
Opening the can or bottle of soda results in fizzing. Shaking the can or bottle before opening the soda, however, allows some of the carbon floating at the top of your soda to get suspended in the liquid. This extra carbon stays in your soda as bigger bubbles than the carbon that is already dissolved, even though the bubbles may look the same size to the human eye. These large bubbles quickly rise to the surface of the soda, causing an explosion on your innocent friend!
All you would have to do is let your soda sit unopened for a while , before eventually opening it. This allows the large bubbles to work themselves out of the soda, and back to the top of the soda where they should be in the first place. Soda fizzes because of carbonation and goes flat if it is left open for too long. Other factors for flatness are whether the can or bottle of gets shaken, rolled, or thrown, the material surrounding the soda, and the temperature of the soda.
The fizz is caused by bubbles in the soda, but you can add more fizz to your soda by adding ice to it. In your section called Soda Explosions! Was there a typo somewhere?
Are people supposed to tap only the bottom of the can, or can one tap the top or the bottom? Is it the tapping that matters or where the tapping is done? Elizabeth - The reason for tapping on the can is that there are tiny bubbles of compressed carbon dioxide gas stuck to the sides and bottom and top of the can. When you tap on the can, you knock these bubbles loose so they all float to the top.
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