Today's supplement to our knowledge is what calcium chloride can react with. Please see the detailed explanation below:
Chemical Properties
Soluble calcium chloride can be used to precipitate certain calcium compounds that are not soluble in water.
3 CaCl2(aq) + 2 K3PO4(aq) → Ca3(PO4)2(s) + 6 KCl(aq) Pure calcium can be obtained after electrolysis of calcium chloride.
　　CaCl2 →Ca(s) + Cl2(g)[5]
Function and Application
Anhydrous calcium chloride is a commonly used drying agent in industries and laboratories, suitable for drying gases like nitrogen, oxygen, hydrogen, hydrogen chloride, and sulfur dioxide, but it should not be used to dry ethanol or ammonia (as it reacts with calcium chloride to form CaCl2·4C2H5OH and CaCl2·8NH3). It serves as a desiccant in the production of alcohols, esters, ethers, and acrylic resins. In the inorganic industry, it is used as a raw material for manufacturing metal calcium, barium chloride, various calcium salts (such as calcium phosphate), and in the construction industry as an antifreeze agent to accelerate concrete hardening and enhance the frost resistance of building mortar. In the microbial industry, it is used as a culture medium for haploid breeding. In analytical chemistry, it is employed to determine the carbon content in steel, whole blood glucose, serum inorganic phosphorus, and serum alkaline phosphatase activity. It acts as a protective and refining agent in aluminum and magnesium metallurgy. Additionally, it serves as a flame retardant for fabrics, a fog dispersant in seaports, a dust collector for road surfaces, and a preservative for food. It is also used as a precipitant in the production of lake pigments and for deinking in waste paper processing. Calcium chloride solutions are crucial refrigerants in the refrigeration industry. During use, they absorb moisture from the air, causing their concentration to decrease, especially in open systems. To prevent a decrease in calcium chloride concentration and an increase in the freezing point temperature, the concentration is regularly measured using a hydrometer. If the concentration drops, it should be replenished to maintain an appropriate level. Calcium chloride solutions are corrosive to equipment, and caution should be exercised during use.