why does a beverage become flat when a container is opened?

Question

This is a question in my chem lab.

The carbon dioxide dissolved in carbonated beverages is in equilibrium with the air inside the container. Explain why the beverage becomes "flat" when the container is opened?

Answer 1

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Answer 2

Gas is very sensitive to changes in pressure and temperature. When the beverage is opened, the equilibrium in the reversible reaction is shifted, so that more CO2 is formed

H2CO3 == H2O + CO2

Gases have high energy molecules and easily escape liquids. The warmer the liquid, the easier for the gas to escape. Gas solubility decreases with increasing temperature.

A warm soda will go flat much faster than a cold one.

Answer 3

it is the pressure that keeps the carbon in balance with the liquid.

when that pressure is relieved the carbon escapes.

look at the examples of volcanic crater lakes. they store large ammounts of CO2 in their water. and every year as seasons change the surface water cools and moves down releasing the pressurized water at the bottom of the lake.

except in equatorial lakes. here the pressure builds up untill something breaks the "seal" of the surface water. usually a rockslide...often with a deadly release of CO2.

Answer 4

becuase air gets in it and causes teh absense of carbonation.