Product Details
Hydrochloric acid, defined as the aqueous solution of hydrogen chloride (HCl), boasts extensive deployment across a full range of industrial processing scenarios. It appears as a transparent liquid ranging from colorless to faint pale yellow, carrying a sharp, pungent characteristic odor and exhibiting extremely high corrosive properties. A 38% hydrochloric acid solution carries a documented melting point of -27.32°C, with its boiling point sitting at roughly 48°C.
Commercially concentrated hydrochloric acid, which generally holds approximately 37% hydrogen chloride by mass, demonstrates strong volatility. Once the storage vessel of concentrated hydrochloric acid is unsealed, hydrogen chloride vapor will rapidly evaporate and diffuse into the ambient atmosphere.
Chemical Properties
| Foreign Name | Hydrochloric acid |
| Chemical Formula | HCI (aq) |
| Molecular Weight | 36.46 |
| CAS Number | 7647-01-0 |
| Melting Point | -27.32 ℃ (38% solution) |
| Boiling Point | 48 ℃ (38% solution) |
| Water Solubility | Frequently soluble in water |
| Appearance | Colorless to pale yellow clear liquid |
| Flash point | Non-flammable |
| Applications | Extracts refined salts, etc. |
| Acidity coefficient | -8 |
| Viscosity | 1.9 mPas (25℃, 31.5% solution) |
Product Application
Hydrochloric acid serves a vast array of high-priority use cases within the chemical manufacturing sector, and delivers a critical, measurable contribution to stabilizing and elevating final product quality. It is widely adopted for industrial steel pickling workflows, and acts as an irreplaceable chemical reagent in the mass production of a large portfolio of both inorganic and organic chemical compounds — most notably vinyl chloride, the core foundational monomer used to manufacture PVC plastics.
Beyond large-scale industrial deployment, hydrochloric acid supports a wide range of smaller-volume, specialized applications. These include household cleaning formulations, the manufacturing of gelatin and other permitted food additives, industrial descaling solutions, and leather tanning and processing operations. As a final point of relevance, hydrochloric acid naturally forms the primary active component of human gastric acid, where it supports normal digestive function and delivers innate defensive effects against pathogenic microbial invasions.
