Potassium tetrachloridocuprate(II)

Potassium tetrachloridocuprate(II)
Names
	IUPAC name Potassium tetrachloridocuprate(II)
	Other names Dipotassium cupric chloride; Dipotassium tetrachlorocuprate; Potassium copper(II) tetrachloride; Potassium tetrachlorocuprate; Potassium tetrachlorocuprate(II); Mitscherlichite (dihydrate mineral);
Identifiers
CAS Number	(anhydrous): 13877-24-2; (dihydrate): 10085-76-4;
3D model (JSmol)	(anhydrous): Interactive image; (dihydrate): Interactive image;
ChemSpider	(anhydrous): 35294061; (dihydrate): 50645744;
PubChem CID	(anhydrous): 22602384; (dihydrate): 25021469;
	InChI (anhydrous): InChI=1S/4ClH.Cu.2K/h41H;;;/q;;;;+2;2+1/p-4 Key: FBNNBYUNXDHBOM-UHFFFAOYSA-J; (dihydrate): InChI=1S/4ClH.Cu.2K.2H2O/h41H;;;;21H2/q;;;;+2;2*+1;;/p-4 Key: QDLOTAGCTPEFOF-UHFFFAOYSA-J;
	SMILES (anhydrous): [Cl-].[Cl-].[Cl-].[Cl-].[K+].[K+].[Cu+2]; (dihydrate): O.O.[Cl-].[Cl-].[Cl-].[Cl-].[K+].[K+].[Cu+2];
Properties
Chemical formula	K2CuCl4 (anhydrous); K2CuCl4·2H2O (dihydrate)
Molar mass	319.585 g/mol (dihydrate)
Appearance	greenish blue crystals (dihydrate)
Density	2.416 g/cm3 at 25 °C (dihydrate)
Structure
Crystal structure	(dihydrate:) Tetragonal.Point Group: 4/m 2/m 2/m (probable). Crystals, short prismatic along [001], or pyramidal {011}, minute; in stalactitic growths
Hazards
	GHS labelling:
Pictograms
NFPA 704 (fire diamond)	2 0 1
Flash point	Non-flammable
Related compounds
Other cations	Cesium tetrachloridocuprate(II); ammonium tetrachloridocuprate(II); rubidium tetrachloridocuprate(II); iron(II) tetrachloridocuprate(II)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Potassium tetrachloridocuprate(II) describes salts with chemical formula K₂CuCl₄(H₂O)₂. It is a greenish blue solid. This form also occurs naturally as the rare mineral mitscherlichite.