Physical Properties Uses Preparation Reactions
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Cobalt(II) hydroxide

Physical Properties Uses Preparation Reactions
Cobalt(II) hydroxide Structure
Cobalt(II) hydroxide
  • CAS No.21041-93-0
  • Chemical Name:Cobalt(II) hydroxide
  • CBNumber:CB0716301
  • Molecular Formula:CoH2O2
  • Formula Weight:92.95
  • MOL File:21041-93-0.mol
Cobalt(II) hydroxide Property
  • Melting point: :°Cd ec.)
  • Density  :3.597 g/mL at 25 °C(lit.)
  • storage temp.  :Inert atmosphere,Room Temperature
  • form  :Powder
  • Specific Gravity :3.597
  • color  :Pink to purple
  • Water Solubility  :Soluble in acids and ammonia. Very slightly soluble in water. Insoluble in dilute alkalis.
  • Sensitive  :Air Sensitive
  • Merck  :14,2442
  • Solubility Product Constant (Ksp) :pKsp: 14.23
  • Stability: :Stability
  • CAS DataBase Reference :21041-93-0(CAS DataBase Reference)
  • EWG's Food Scores :1
  • FDA UNII :51B9AYG60K
  • EPA Substance Registry System :Cobalt hydroxide (Co(OH)2) (21041-93-0)
Safety
Hazard and Precautionary Statements (GHS)
  • Symbol(GHS)
  • Signal wordDanger
  • Hazard statements H302+H332-H317-H319-H334-H351-H410-H302
  • Precautionary statements P261-P273-P280-P284-P304+P340+P312-P342+P311-P280g-P301+P312a-P321-P333+P313-P501a
Cobalt(II) hydroxide Price More Price(16)
  • Brand: Sigma-Aldrich
  • Product number: 342440
  • Product name : Cobalt(II) hydroxide
  • Purity: technical grade, 95%
  • Packaging: 250g
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  • Updated: 2021/12/16
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  • Brand: Alfa Aesar
  • Product number: 012524
  • Product name : Cobalt(II) hydroxide, 99.9% (metals basis)
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  • Updated: 2021/12/16
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  • Brand: Alfa Aesar
  • Product number: 012524
  • Product name : Cobalt(II) hydroxide, 99.9% (metals basis)
  • Purity: 
  • Packaging: 100g
  • Price: $47
  • Updated: 2021/12/16
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  • Brand: Strem Chemicals
  • Product number: 93-2741
  • Product name : Cobalt(II) hydroxide (97%-Co)
  • Purity: 
  • Packaging: 50g
  • Price: $40
  • Updated: 2021/12/16
  • Buy: Buy
  • Brand: Strem Chemicals
  • Product number: 93-2741
  • Product name : Cobalt(II) hydroxide (97%-Co)
  • Purity: 
  • Packaging: 250g
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Cobalt(II) hydroxide Chemical Properties,Usage,Production

  • Physical Properties Two forms occur, a rose-red powder (more stable) and a bluish-green powder less stable than the red form; rhombohedral crystals; density 3.597 g/cm3; decomposes on heating; practically insoluble in water 3.2 mg/L; Ksp 1.0x10–15; soluble in acids and ammonia; insoluble in dilute alkalis.
    Cobalt(II) hydroxide
    The addition of alkali metal hydroxides to solutions of cobalt(II) salts results in the precipitation of cobalt(II) hydroxide in either a blue or pink form depending upon the conditions. The pink form is the more stable of the two and is obtained when a suspension of the blue form is allowed to stand or is warmed. Cobalt(II) hydroxide is amphoteric, dissolving in alkalis to form blue solutions of the [Co(OH)4]2~ ions. In the presence of alkali, suspensions of Co(OH)8 are oxidized by air to the brown CoO(OH), this oxidation being brought about rapidly by oxidants such as hypochlorite, bromine water or hydrogen peroxide. The pink Co(OH)2 (density 3.597) has the brucite (Mg(OH)2) structure in which the cobalt atoms are surrounded by six hydroxides. The blue form is more disordered, but its structure is not known for certain.
  • Uses Cobalt(II) hydroxide is used as a drier for paints and varnishes and is added to lithographic printing inks to enhance their drying properties. Other applications are in the preparation of cobalt salts; as a catalyst; and in storage battery electrodes.
  • Preparation Cobalt(II) hydroxide is obtained as a precipitate when an alkaline hydroxide is added to an aqueous solution of cobalt(II) salt:
    CoCl2 + 2NaOH → Co(OH)2 + 2NaCl
    Co(NO3)2 + 2NaOH → Co(OH)2 + 2NaNO3
  • Reactions Thermal decomposition to cobaltous oxide, CoO, occurs at 168°C in a vacuum.
    Cobalt(II) hydroxide is oxidized by air and other oxidizing agents, forming cobalt(III) hydroxide, Co(OH)3. Reactions with mineral acids produce corresponding Co2+ salts.
  • Description The addition of alkali metal hydroxides to solutions of cobalt(II) salts results in the precipitation of cobalt(II) hydroxide in either a blue or pink form depending upon the conditions. The pink form is the more stable of the two and is obtained when a suspension of the blue form is allowed to stand or is warmed. Cobalt(II) hydroxide is amphoteric, dissolving in alkalis to form blue solutions of the [Co(OH)4]2- ions. In the presence of alkali, suspensions of Co(OH) are oxidized by air to the brown CoO(OH), this oxidation being brought about rapidly by oxidants such as hypochlorite, bromine water or hydrogen peroxide. The pink Co(OH)2 (density 3.597) has the brucite (Mg(OH)2) structure in which the cobalt atoms are surrounded by six hydroxides. The blue form is more disordered, but its structure is not known for certain.
  • Chemical Properties Rose-red powder.Soluble in acids and ammonium salt solutions; insoluble in water and alkalies.
  • Uses Cobalt salts, paint and varnish driers, catalyst, storage-battery electrodes.
  • Uses Cobalt(II) hydroxide is used as a drying agent for paints and varnishes. It acts as an aid to dry the lithographic inks and catalyst in the preparation of battery electrode impregnating solutions. It is also involved in the synthesis of other cobalt compounds.
Cobalt(II) hydroxide Preparation Products And Raw materials
Raw materials
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21041-93-0, Cobalt(II) hydroxideRelated Search:
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