What is the chemical formula for carbonated water? How is it determined?

Carbonated water does not have a single fixed formula because it is a solution of carbon dioxide (CO₂) in water (H₂O). However, it is commonly represented by the formation of carbonic acid (H₂CO₃).

Chemical representation:

CO₂ + H₂O ⇌ H₂CO₃

How is this determined?

• When CO₂ gas is dissolved in water under pressure
• It reacts with water molecules to form carbonic acid
• This equilibrium is studied using chemical equilibrium principles

Important points:

• Carbonated water is a mixture, not a pure compound
• Only a small amount of CO₂ actually converts to H₂CO₃
• Most CO₂ remains physically dissolved

Key Takeaway:

Carbonated water is best described as CO₂ dissolved in H₂O, with partial formation of H₂CO₃, determined through equilibrium reactions.