Shaken, then opened, soda fizzing?

  • Thread starter dpd-7
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When you open the bottle slowly, the CO2 has more time to redissolve and the pressure drop above the liquid is not as sharp. What is the effect of carbonation on the freezing point of water?In summary, the rate at which carbon dioxide leaves solution in a bottle of soda depends on factors such as the amount of CO2, its energy, and the pressure above the liquid. When the bottle is opened quickly, the pressure drop is sharp and results in a more violent reaction, while opening the bottle slowly allows the CO2 more time to redissolve and reduces the pressure drop. Additionally, carbonation can lower the freezing point of water, potentially contributing to the "instant freezing" effect observed when a supercooled bottle
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dpd-7
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I am aware that shaking an unopened bottle of soda imparts energy, creating turbulence and forming bubbles. Therefore, if the bottle is then opened the drink 'fizzes' out due to increased effervescence. If the bottle cap is unscrewed slowly then this fizzing appears to be reduced. My question is this: Is that reduction simply due to giving the carbon dioxide more time to redissolve or is there another mechanism at work, for example, due to the increased time over which the pressure in the bottle changes when then cap is unscrewed slowly.

Additionally, what effect does carbonation have on the freezing point of water and what effect might this have on the 'instant freezing' effect observed when a bottle of soda/ beer is super cooled and then tapped/ opened providing nucleation sites?
 
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  • #2
Welcome to PF;
The rate that CO2 leaves solution depends on how much is in solution, the energy it has, and the pressure of the gas above the liquid surface (and other things too). When you open the bottle quickly, you create a sharp drop in pressure above the gap - making for a more violent reaction.
 

1. How does shaking a soda cause it to fizz?

When a soda is shaken, the carbon dioxide gas that is dissolved in the liquid becomes agitated and forms bubbles. This is due to the decrease in pressure caused by shaking, which allows the gas to escape from the liquid in the form of bubbles.

2. Why does a soda fizz more when opened after being shaken?

When a shaken soda is opened, the sudden release of pressure causes the carbon dioxide gas to rapidly expand, creating more bubbles and resulting in a fizzing effect. This is because the gas was previously forced into the liquid under high pressure, and when the pressure is released, it tries to escape quickly.

3. Can shaking a soda cause it to explode?

In rare cases, shaking a soda can cause it to explode. This typically occurs when the soda is already under high pressure and agitation from shaking causes the pressure to increase even further. It is important to handle sodas carefully and avoid shaking them excessively to prevent this from happening.

4. How long does it take for a shaken soda to settle?

The amount of time it takes for a shaken soda to settle varies, but on average, it can take anywhere from a few minutes to an hour. This is because the carbon dioxide gas needs time to re-dissolve into the liquid and for the pressure inside the bottle to equalize.

5. Will shaking a soda change its taste?

Shaking a soda does not change its taste, as the ingredients and flavoring are not altered by the agitation. However, the fizzing caused by shaking can affect the texture and perceived taste of the soda, making it seem more carbonated or acidic.

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