Is HCl a strong acid, or is H2CO3?

Hydrochloric acid — also known as muriatic acid — is a strong acid, while carbonic acid is a weak acid. The chemical formula for hydrochloric acid is HCl. The formula for carbonic acid is H₂CO₃.

Acids are substances that release hydrogen ions when added to water. Strong acids completely dissociate in water, releasing all of their hydrogen ions; weak acids release only a portion.

Some uses for hydrochloric acid include:

• Cleaning the surface of metal before it is processed further
• Acidifying the stomach
• Acting as a reagent in various manufacturing processes

Some uses of carbonic acid include:

• Generating CO₂ in the production of soft drinks and other carbonated drinks
• Participating in the transport of CO₂ from the blood to the lungs
• Acting as a sink in the oceans for excess CO₂ in the atmosphere