Hydrochloric acid is a colorless liquid with a sharp and extremely irritating odor.
Upon exposure to air, there is an immediate release of toxic hydrogen chloride gas. As a strong corrosive acid, hydrochloric acid reacts with many metals producing flammable hydrogen gas that can become an explosion hazard. Acute Effects A. Ingestion - Mucosal as well as severe esophageal corrosive injury. Chemical burns of the mouth, pharynx and stomach can develop. Injury may be severe and cause death.