Zinc chloride is a white crystalline compound widely used in industrial, chemical, and commercial applications. With the chemical formula ZnCl₂, it is known for its high solubility in water and strong dehydrating properties. In this article, we explore the key physical and chemical properties of zinc chloride, its common industrial uses, and important safety and handling information.
What Is Zinc Chloride?
Chemical name: Zinc Chloride
Molecular formula: ZnCl₂
Molar mass: 136.28 g/mol
CAS Number: 7646-85-7
PubChem CID: 3007855
Zinc chloride consists of one zinc ion (Zn²⁺) and two chloride ions (Cl⁻). It is hygroscopic and must be stored in tightly sealed containers to prevent moisture absorption.
Physical and Chemical Properties
Property Value
Appearance White crystalline solid
Density 2.91 g/cm³
Melting Point ~290°C
Boiling Point ~732°C (decomposes)
Solubility in Water Highly soluble
Odor Odorless
Zinc chloride is also soluble in alcohol, glycerol, and ether.
Zinc Chloride Uses
Zinc chloride is a versatile industrial chemical used in multiple applications:
Metallurgy & Soldering
Acts as a flux to clean metal surfaces before soldering.
Chemical Manufacturing
Used in the synthesis of organic compounds, dyes, and pharmaceuticals.
Battery Industry
A common electrolyte component in dry cell batteries.
Wood Preservation
Used to protect wood against decay and insects.
Catalyst in Organic Reactions
Facilitates specific condensation and rearrangement reactions.
Safety and Hazards
Zinc chloride is classified as a corrosive substance. It must be handled with care, especially in industrial settings.
Skin contact: Causes burns and irritation
Eye contact: Can result in severe eye damage
Inhalation: May cause respiratory tract irritation
Ingestion: Harmful if swallowed
⚠️ GHS Hazard Classification:
Skin Corrosion: Category 1
Serious Eye Damage: Category 1
Environmental Hazard: Harmful to aquatic life
Storage and Handling Tips
To safely store and handle zinc chloride:
Keep in a dry, well-ventilated area
Use protective gloves, goggles, and masks
Avoid direct contact with water or humid air
Dispose of waste materials according to local regulations
Zinc Chloride in Research and Industry
Zinc chloride is extensively used in laboratory research, especially in the synthesis of advanced materials, catalysis, and biochemical analysis. It plays a role in the development of new battery technologies, making it a valuable compound in modern science and industry.
Conclusion
Zinc chloride (ZnCl₂) is a powerful chemical with diverse applications ranging from metallurgy to medicine. However, due to its corrosive and toxic nature, it must be used with appropriate safety measures. Whether you’re a researcher, chemical supplier, or industry professional, understanding the properties and handling of zinc chloride is essential.