We often consume soft drinks while celebrating, in parties. We like to carry soft drinks while hanging out with friends. Sometimes we play with the froth that comes out after shaking the bottle of soft drink, sometimes we play this trick in front of our younger sister and brothers and saying MAGIC!!!
But have you ever thought, why we get the froth when we shake soft drink bottle or why a fizzy sound comes out from the bottle when we open the cap of the bottle?
Is really some kind of magic? Let explore what magic inside it.’
Whenever carbon dioxide gas comes in contact with water, it undergoes a chemical reaction to produce aqueous carbonic acid. It is the carbonic acid which is responsible for flavour and a sweet sensation in the mouth.
H2O +CO2 –>H2CO3
Why is froth formed?
What comes out from soft drink when we shake it is bubbles.
Since inside the bottle, the pressure is always in a uniform state but when we shake soft drink bottle we provide energy to the bottle and this energy is enough to the gas molec ule to break liquid’s surface tension. However, once a small bubble is formed, it is easier (requires less energy) for the surrounding gas molecules to join it to form a bigger bubble and escape through. Shaking the bottle introduces a lot of small bubbles into the liquid. As you continue shaking the bottle, more and more energy is imparted to the gas molecules and more bubbles become attached to the bubbles that are already present, thus making the process of the gas escape even more rapid and this process is so fast that it seems like a foam comes out from it.
Do you know why tapping on beer bottle makes a frothy volcano? Watch out for the next post: Why tapping a Beer Bottle creates a Frothy Volcano.
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