Zinc Chloride CAS 7646-85-7, Zinc Chloride, CAS 7646-85-7
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Chemical properties:Hydrolyzability: It dissolves in water to form a complex acid H[ZnCl₂(OH)], and the solution is acidic (pH≈4).
7646-85-7
Cl2Zn
136.3
231-592-0
| CAS | 7646-85-7 |
| Molecular formula | Cl2Zn |
| Molecular weight | 136.3 |
| EIENCS | 231-592-0 |
| Form | crystalline |
| Melting point | 293 °C (lit.) |
| boling point | 732 °C (lit.) |
| Density | 1.01 g/mL at 20 °C |
| Solubility | H2O: 4 M at 20 °C, clear, colorless |
| PKA | pKa 6.06 (Uncertain) |
| Color | white |
| Storage temp |
Chemical properties:
Hydrolyzability: It dissolves in water to form a complex acid H[ZnCl₂(OH)], and the solution is acidic (pH≈4).
Reactivity
It reacts with metal oxides to form soluble complexes (such as removing rust in welding) : ce2H[ZnCl2(OH)]+FeO−>Fe[ZnCl2(OH)]2+H2O
It reacts with strong alkali to form zinc hydroxide precipitate: ceZnCl2+2NaOH−>2NaCl+Zn(OH)2↓
Thermal stability: High-temperature decomposition generates hydrogen chloride and zinc oxide fumes.
Physical properties:
It has good electrical conductivity in the molten state and produces thick white smoke when burned.
It has strong hygroscopicity and rapidly deliquesces when exposed to air.
Chemical synthesis: Organic reaction dehydrating agents, condensing agents (such as esterification and acylation reactions), Lewis acid catalysis, promoting proton transfer
Electroplating and batteries: Ammonium salt zinc plating electrolyte additive, dry battery electrolyte, enhances conductivity, and regulates pH value
Wood and preservation: Wood preservatives and flame retardants form protective films to inhibit microbial degradation
Dyes and Textiles: Mordants, weight gain agents (cotton fiber treatment), enhance the binding force of dyes, and improve fiber strength
Medicine: 1% solution mouthwash astringent, 10% solution dental desensitizer, astringent wound surface, reduce dental nerve sensitivity
Environmentally friendly materials: Activated carbon activator (increasing specific surface area), creating pores to enhance adsorption performance
Toxicity:
Acute toxicity: Oral LD₅₀ in rats was 350 mg/kg; Inhaling high-concentration smoke can cause bronchopneumonia and even death.
Irritation: Skin contact can cause "bird's eye type" ulcers, and eye contact can burn the cornea.
Protective measures:
Operating requirements: Wear a dust mask, chemical goggles, rubber acid and alkali resistant clothing and gloves.
Leakage treatment: Cover with plastic sheeting and clean up to prevent water contact (it releases heat and HCl when exposed to water).
Environmental risk: Highly toxic to aquatic organisms (Acute Hazard Category 1).
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