Chemical Formula: CoCl? · 6H?O
Molecular Weight: 237.93 g/mol
Cobalt Chloride is a deep purple to pink crystalline compound widely used as a humidity indicator, catalyst, and laboratory reagent. The hexahydrate form (CoCl?·6H?O) is the most common, known for its distinct color change from blue (anhydrous) to pink (hydrated) when exposed to moisture. This property makes it an excellent desiccant indicator and chemical moisture detector in various applications.

Applications

• Humidity Indicator:
  Used in silica gel desiccants and moisture detection cards due to its color-changing property.

• Catalyst:
  Serves as a catalyst or catalyst precursor in organic synthesis and industrial chemical reactions.

• Electroplating:
  Employed in cobalt electroplating baths to provide wear-resistant and decorative metal coatings.

• Pigment Manufacturing:
  Used in the production of ceramic glazes, inks, and glass colorants for a rich blue hue.

• Laboratory Use:
  Acts as a reagent and analytical standard for cobalt ion detection and research experiments.