Hydrogen chloride and hydrochloric acid are two common chemicals that share certain similarities but also some notable differences. Hydrogen chloride (HCl) is a colorless gas that has a pungent taste and is highly corrosive; Hydrochloric acid (HCl) is the form of hydrogen chloride in aqueous solution, which is acidic.

Chemically, hydrogen chloride and hydrochloric acid are strong acids that react with bases to form corresponding salts. However, hydrogen chloride is unstable and easily decomposes into chlorine and hydrogen, while hydrochloric acid is relatively stable.

In terms of uses and applications, hydrogen chloride is often used in industrial production, such as as a raw material in metallurgy, organic synthesis and other fields; Hydrochloric acid is widely used in the laboratory, as a common reagent, but also in medicine, metallurgy, environmental protection and other fields have important applications.

In terms of safety, hydrogen chloride is highly corrosive and irritating, which can cause serious burns and injuries when it comes into contact with skin and mucous membranes; Hydrochloric acid is relatively less corrosive, but it is still necessary to pay attention to safe operation and avoid direct contact with skin and eyes.

Hydrogen chloride and hydrochloric acid have some differences in chemical properties, uses and safety. Whether it is industrial production or laboratory operation, we should correctly understand and use these two chemical substances to ensure work safety and environmental health.