Calcium chloride (chemical formula: CaCl2) is a white or slightly yellow solid inorganic compound, belonging to the salt category. It is a typical ionic halide, widely used in multiple fields due to its high solubility, hygroscopicity, and dehydration. According to its hydrated form, it exists in different physical forms, with the most common being dihydrate (CaCl2 · 2H2O). Its high solubility allows it to quickly dissolve in water, releasing a large amount of heat, making it very useful in applications that require rapid heating or drying. In addition, calcium chloride is also commonly used in saltwater, road deicing agents, and desiccants used in refrigeration equipment.

Calcium chloride (chemical formula: CaCl2) is a white or slightly yellow solid inorganic compound, belonging to the salt category. It is a typical ionic halide, widely used in multiple fields due to its high solubility, hygroscopicity, and dehydration. According to its hydrated form, it exists in different physical forms, with the most common being dihydrate (CaCl2 · 2H2O). Its high solubility allows it to quickly dissolve in water, releasing a large amount of heat, making it very useful in applications that require rapid heating or drying. In addition, calcium chloride is also commonly used in saltwater, road deicing agents, and desiccants used in refrigeration equipment.

Physical Property

Colorless cubic crystal, odorless, with a slightly bitter taste. Appearance can be powder, flake and pellet. Exposed to the air, it is highly susceptible to deliquescence. Easy to dissolve in water, with a solubility of 74.0 g/100 g of water at 20 ℃, while releasing a large amount of heat (the dissolution enthalpy of calcium chloride is -176.2 cal/g). This property makes it very useful in applications that require rapid heat generation, such as serving as a heat source in certain heating processes. In addition, the specific heat capacity and thermal conductivity of calcium chloride are also important physical parameters that affect its efficiency in thermal management and regulation applications. Calcium chloride aqueous solution is neutral. Easy to dissolve in various polar and protonic solvents, solubility in the following solvents (g/100mL solvent) at 20 ℃: methanol: 29.2, anhydrous ethanol: 25.8, n-propanol: 15.8, n-butanol: 25.0, n-pentanol: 11.5, ethylene glycol: 21.6 (25 ℃), formic acid: 43.1, acetic acid: 15.0 (30 ℃), hydrazine: 16.0. But in dipole solvents and low polarity solvents, such as ether, tetrahydrofuran, etc., they are only slightly soluble or insoluble. React with ammonia or ethanol to generate CaCl2 · 8NH3 and CaCl2 · 4C2H5OH complexes, respectively. At low temperatures, the solution crystallizes and precipitates hexahydrate. When gradually heated to 30 ℃, it dissolves in its own crystalline water and gradually loses water. When further heated to 200 ℃, it becomes dihydrate. When further heated to 260 ℃, it becomes white porous anhydrous calcium chloride. During the heating and dehydration process of hydrated calcium chloride, some parts undergo hydrolysis reactions, resulting in the presence of small amounts of CaO impurities in the product.

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