When you open a bottle of a soft drink and leave it open, the drink eventually goes flat. This happens because the equilibrium between carbonic acid and carbon dioxide shifts to produce

Question

Quizplus · Accepted Answer

When a soft drink is opened, the pressure is released and carbon dioxide gas is able to escape from the liquid. This disrupts the equilibrium between carbonic acid and carbon dioxide, causing the reaction to shift towards more carbon dioxide to re-establish equilibrium. As a result, the concentration of carbon dioxide in the drink decreases, causing it to go flat.

When You Open a Bottle of a Soft Drink and Leave