Cobalt(II) chloride

Cobalt(II) chloride ;
Names:	cobalt chloride; cobalt(II) chloride;
Formula:	CoCl2 (anhydrous); CoCl2 · H2O (monohydrate); CoCl2 · 2H2O (dihydrate); CoCl2 · 6H2O (hexahydrate);
Molar mass:	129.839 g/mol (anhydrous); 147.854 g/mol (monohydrate); 165.869 g/mol (dihydrate); 237.928 g/mol (hexahydrate);
Density:	1.92 g/cm3 (hexahydrate); 2.48 g/cm3 (dihydrate); 3.36 g/cm3 (anhydrous);
Crystal system:	monoclinic (hexahydrate); a=10.34 Å, b=7.06 Å, c=6.67 Åα=90°, β=122°, γ=90°; monoclinic (dihydrate); α=90°, γ=90°; orthorhombic (anhydrous); α=90°, β=90°, γ=90°;
Shapes:	https://en.crystalls.info/w/uploads/media/0/0e/Truncated_rhombic_bipyramid.json Truncated rhombic bipyramid https://en.crystalls.info/w/uploads/media/f/fa/Truncated_rhombic_pyramid.json Truncated rhombic pyramid ;
Color:	blue (anhydrous); red (hexahydrate);
Decomposition point:	87 °C360.15 K <br />188.6 °F <br />648.27 °R <br /> (hexahydrate); 101 °C374.15 K <br />213.8 °F <br />673.47 °R <br /> (dihydrate); 138 °C411.15 K <br />280.4 °F <br />740.07 °R <br /> (monohydrate);
Stability:	stable (hexahydrate)

Description

Inorganic compound, salt of transitional metal cobalt and inorganic hydrochloric acid. From water solutions crystallizes as hexahydrate, dihydrate and monohydrate.

Addition of hydrochloric acid prevents hydrolysis.

Anhydrous compound is hygroscopic. Solubility is in anhydrous

TableGraph

Chlorides
Salts	Ammonium chloride (NH₄Cl) • Barium chloride (BaCl₂) • Calcium chloride (CaCl₂) • Cadmium chloride (CdCl₂) • Cobalt(II) chloride (CoCl₂) • Copper(II) chloride (CuCl₂) • Iron(II) chloride (FeCl₂) • Iron(III) chloride (FeCl₃) • Lead(II) chloride (PbCl) • Manganese(II) chloride (MnCl₂) • Potassium chloride (KCl) • Sodium chloride (NaCl) • Strontium chloride (SrCl₂) • Tin(II) chloride (SnCl₂) • Zirconyl chloride (ZrOCl₂)
Double salts	Rubidium-gold(III)-palladium(II) chloride (2RbCl · AuCl₃ · PdCl₂)
Adducts	Diglycine hydrochloride (2NH₂CH₂COOH · HCl) • Glutamic acid hydrochloride (C₅H₉NO₄ · HCl) • Glucose and sodium chloride adduct (2C₆H₁₂O₆ · NaCl) • Hydroxylammonium chloride (NH₂OH · HCl) • P-nitroaniline hydrochloride (C₆H₆N₂O₂ · HCl) • Urea and sodium chloride adduct (CO(NH₄)₂ · NaCl)
Complexes	Ammonium pentachloroferrate(III) ((NH₄)₂[FeCl₅]) • Ammonium tetrachlorocuprate(II) ((NH₄)₂[CuCl₄]) • Lithium trioxalatoferrate(III)-chloride (Li₄[Fe(C₂O₄)₃]Cl) • Hexamminecobalt(III) chloride ([Co(NH₃)₆]Cl₂) • Hexaamminenickel chloride ([Ni(NH₃)₆]Cl₂) • Potassium hexachlororhodate(III) (K₃[RhCl₆])

Cobalt compounds
Salts	Cobalt(II) chloride (CoCl₂) • Cobalt(II) nitrate (Co(NO₃)₂) • Cobalt(II) oxalate (CoC₂O₄) • Cobalt(II) sulfate (CoSO₄) • Cobalt(II) tartrate (CoC₄H₄O₆)
Double salts	Cerium(III)-cobalt nitrate (3Co(NO₃)₂ · 2Ce(NO₃)₃) • Cerium(III)-cobalt-manganese nitrate (3(Co,Mn)(NO₃)₂ · 2Ce(NO₃)₃) • Cobalt(II)-ammonium sulfate ((NH₄)₂Co(SO₄)₂) • Cobalt(III)-ammonium sulfate (NH₄Co(SO₄)₂) • Cobalt(II)-potassium sulfate (K₂Co(SO₄)₂)
Complexes	Cyanocobalamin (C₆₃H₈₈CoN₁₄O₁₄P) • Hexamminecobalt(III) chloride ([Co(NH₃)₆]Cl₂) • Hexanitrocobaltates • Hexacyanocobaltates • Trioxalatocobaltates

Cobalt(II) chloride
Names:	cobalt chloride cobalt(II) chloride
Formula:	CoCl₂ (anhydrous) CoCl₂ · H₂O (monohydrate) CoCl₂ · 2H₂O (dihydrate) CoCl₂ · 6H₂O (hexahydrate)
Molar mass:	129.839 g/mol (anhydrous) 147.854 g/mol (monohydrate) 165.869 g/mol (dihydrate) 237.928 g/mol (hexahydrate)
Density:	1.92 g/cm³ (hexahydrate) 2.48 g/cm³ (dihydrate) 3.36 g/cm³ (anhydrous)
Crystal system:	monoclinic (hexahydrate) a=10.34 Å, b=7.06 Å, c=6.67 Åα=90°, β=122°, γ=90° monoclinic (dihydrate) α=90°, γ=90° orthorhombic (anhydrous) α=90°, β=90°, γ=90°
Shapes:	Truncated rhombic bipyramid Truncated rhombic pyramid
Color:	blue (anhydrous) red (hexahydrate)
Decomposition point:	87 °C360.15 K <br />188.6 °F <br />648.27 °R <br /> (hexahydrate) 101 °C374.15 K <br />213.8 °F <br />673.47 °R <br /> (dihydrate) 138 °C411.15 K <br />280.4 °F <br />740.07 °R <br /> (monohydrate)
Stability:	stable (hexahydrate)