What is Copper(II)chloride anhydrous

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Chemical properties
Slowly absorbs moisture in the air to form blue-green copper chloride dihydrate; in concentrated hydrochloric acid, it is yellow-green due to the formation of [CuCl4]2-compatible ions.

When heated, CuCl2 can be reduced to metallic copper by hydrogen, and can also be reduced to copper chloride by ammonia:
2 CuCl2+ H2 → 2 CuCl + 2 HCl
6 CuCl2 + 2 NH3 → 6 CuCl + N2 +6 HCl

Decomposed to cuprous chloride and chlorine above 1000 °C:
2 CuCl2 → 2 CuCl + Cl2

structure
Anhydrous CuCl2 is a deformed cadmium iodide structure, and its structure contains a polylong chain of flat CuCl4. Due to the Ginger-Taylor effect, when a pair of ligands is involved, a d-electron is localized in the molecular orbital of a strong anti-bond, so most copper(II) compounds deviate from the ideal octahedral structure.

preparation
Copper chloride can be prepared by reacting copper oxide, copper hydroxide or basic copper carbonate with hydrochloric acid:
CuO + 2 HCl → CuCl2 + H2O
Cu(OH)2 + 2 HCl → CuCl2 + 2 H2O

The precipitated CuCl2·2H2O crystal is heated and dehydrated in a hydrogen chloride atmosphere to obtain anhydrous copper chloride, and the dehydrating agent such as thionyl chloride or phosphorus pentoxide may be used to remove the crystal water.
Anhydrous CuCl2 can be directly combined with dry copper at 450 ° C to obtain:
Cu + Cl2 → CuCl2
Pure CuCl2 can be obtained by cooling the hot dilute hydrochloric acid solution of copper chloride with CaCl2-ice bath.

Security Information
Copper chloride is a toxic substance, which is extremely toxic to aquatic organisms and has long-term adverse effects on the water environment. If an accident occurs or is uncomfortable when the human body comes into contact with anhydrous copper chloride, seek medical advice immediately.

Security term
S26: In case of accidental contact with eyes, rinse immediately with plenty of water and seek medical advice.
S29: Do not pour into the sewer.
S37/39: Wear appropriate gloves and goggles or mask.
S45: In case of accident or discomfort, seek medical advice immediately (if possible, show the label).
S57: Use appropriate containers to avoid environmental pollution.

Risk term
R25: Toxic if swallowed.
R36/37/38: Irritating to eyes, respiratory system and skin.
Irritating to eyes, respiratory system and skin.
R50/53: Very toxic to aquatic organisms and may have long-term adverse effects on the aquatic environment.

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