Hydrochloric acid CAS#7647-01-0
Wide Industrial Applicability: Hydrochloric acid has a broad range of industrial applications, making it an important chemical raw material.
High Chemical Reactivity: As an aqueous solution of hydrogen chloride, it offers strong chemical activity suitable for various processing applications.
Clear and Consistent Physical Properties: Available as a colorless to pale yellow transparent liquid with well-defined melting and boiling characteristics.
High Concentration Availability: Concentrated hydrochloric acid can reach approximately 37–38% by mass, providing strong acidity for industrial processes.
Hydrochloric acid is an aqueous solution of hydrogen chloride (HCl) and is widely used in various industrial applications. It is a clear, colorless to pale yellow liquid with a strong, pungent odor and highly corrosive properties. A 38% hydrochloric acid solution has a melting point of -27.32°C and a boiling point of approximately 48°C.
Concentrated hydrochloric acid, typically containing around 37% hydrogen chloride by mass, is highly volatile. When a container of concentrated hydrochloric acid is opened, hydrogen chloride gas readily evaporates into the surrounding air.
| 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) |
Hydrochloric acid has numerous important applications in the chemical industry and plays a significant role in maintaining product quality. It is commonly used for steel pickling and serves as an essential chemical reagent in the large-scale production of many inorganic and organic compounds, including vinyl chloride, a key precursor for PVC plastics.
Hydrochloric acid also has a variety of smaller-scale applications, such as household cleaning, the production of gelatin and other food additives, descaling formulations, and leather processing. In addition, hydrochloric acid is a major component of gastric acid, where it helps promote digestion and provides protection against microbial infections.
