page_title: Calcium chloride
section_title: Properties
hierarchical_section_title: Calcium chloride / Properties
caption_attribution_description: 한국어: 염화칼슘(CaCl2) 불꽃 반응English: Flame test on Calcium Chloride(CaCl2)
context_page_description: Calcium chloride is an inorganic compound, a salt with the chemical formula CaCl₂. It is a white coloured crystalline solid at room temperature, and it is highly soluble in water. It can be created by neutralising hydrochloric acid with calcium hydroxide.
  Calcium chloride is commonly encountered as a hydrated solid with generic formula CaCl₂ₓ, where x = 0, 1, 2, 4, and 6. These compounds are mainly used for de-icing and dust control. Because the anhydrous salt is hygroscopic, it is used as a desiccant.
context_section_description: Calcium chloride dissolves in water, producing chloride and the aquo complex [Ca(H₂O)₆]²⁺. In this way, these solutions are sources of "free" calcium and free chloride ions. This description is illustrated by the fact that these solutions react with phosphate sources to give a solid precipitate of calcium phosphate:
  3 CaCl₂  +  2 PO³⁻
  ₄  →  Ca₃(PO₄)₂  +  6 Cl⁻
  Calcium chloride has a very high enthalpy change of solution, indicated by considerable temperature rise accompanying dissolution of the anhydrous salt in water.  This property is the basis for its largest-scale application.
  Molten calcium chloride can be electrolysed to give calcium metal and chlorine gas:
  CaCl₂ → Ca + Cl₂
caption: Flame test of CaCl2
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