Cobalt(II) Chloride

CoCl₂

IUPAC: Cobalt(II) chloride

CAS: 7646-79-9

Overview

Cobalt(II) chloride changes from blue (anhydrous) to pink (hydrated) with moisture, making it a popular humidity indicator. It is used in silica gel desiccants.

Composition

Element Symbol Atoms Atomic Mass
Chlorine Cl 2 35.4500
Cobalt Co 1 58.9330

Elemental Composition

Cl
Chlorine ×2
54.6%
Co
Cobalt ×1
45.4%

Uses

  • • Humidity indicator
  • • Invisible ink
  • • Electroplating
  • • Catalyst

Fun Facts

  • ✦ The blue-to-pink color change with humidity is used in weather-predicting novelty items

Safety

  • ⚠ Carcinogen
  • ⚠ Toxic

Structure

SMILES

[Cl-].[Cl-].[Co+2]

Properties

Type
salt
State
solid
Molar Mass
129.84 g/mol
Density
3.3560 g/cm³
Melting Point
735.0 °C
Boiling Point
1049.0 °C
Solubility
529 g/L at 20°C

Molecular Descriptors

Exact Mass
128.8709
TPSA
0.0 Ų
H-Bond Donors
0
H-Bond Acceptors
2
Rotatable Bonds
0
Heavy Atoms
3
Complexity
0.0

Related Compounds

Ammonium Bicarbonate

NH₄HCO₃

Ammonium Chloride

NH₄Cl

Ammonium Sulfate

(NH₄)₂SO₄

Barium Carbonate

BaCO₃

Barium Chloride

BaCl₂

Barium Sulfate

BaSO₄

Cadmium Sulfide

CdS

Calcium Acetate

Ca(C₂H₃O₂)₂

Calcium Carbonate

CaCO₃

Calcium Citrate

Ca₃(C₆H₅O₇)₂

Frequently Asked Questions

What is Cobalt(II) Chloride?
Cobalt(II) Chloride (CoCl₂) is a salt compound with the IUPAC name Cobalt(II) chloride.
What is the molecular weight of Cobalt(II) Chloride?
Cobalt(II) Chloride has a molar mass of 129.84 g/mol.
What state is Cobalt(II) Chloride at room temperature?
Cobalt(II) Chloride is a solid at room temperature.
Is Cobalt(II) Chloride organic or inorganic?
Cobalt(II) Chloride is classified as an inorganic compound.
What elements make up Cobalt(II) Chloride?
Cobalt(II) Chloride (CoCl₂) is composed of Chlorine (Cl), Cobalt (Co).