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HomeProduct name listCobalt(II) hydroxide

Cobalt(II) hydroxide

Synonym(s):Cobalt dihydroxide;Cobalt(2+) hydroxide;Cobaltous hydroxide

  • CAS NO.:21041-93-0
  • Empirical Formula: CoH2O2
  • Molecular Weight: 92.95
  • MDL number: MFCD00016015
  • EINECS: 244-166-4
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-10-30 18:52:02
Cobalt(II) hydroxide Structural

What is Cobalt(II) hydroxide?

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.

The Uses of Cobalt(II) hydroxide

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.

The Uses of Cobalt(II) hydroxide

Cobalt salts, paint and varnish driers, catalyst, storage-battery electrodes.

What are the applications of Application

Cobalt(II) hydroxide is a drying agent, catalyst, and precursor to other cobalt compounds

Flammability and Explosibility

Not classified

Properties of Cobalt(II) hydroxide

Melting point: °Cd ec.)
Density  3.597 g/mL at 25 °C(lit.)
vapor pressure  0Pa at 20℃
storage temp.  Inert atmosphere,Room Temperature
solubility  slightly soluble in H2O; soluble in acid solutions
form  Powder
color  Pink to purple
Specific Gravity 3.597
PH 9.15(1 mM solution);9.15(10 mM solution);9.15(100 mM solution)
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
Exposure limits ACGIH: TWA 0.02 mg/m3
Stability: Stability
CAS DataBase Reference 21041-93-0(CAS DataBase Reference)
EPA Substance Registry System Cobalt hydroxide (Co(OH)2) (21041-93-0)

Safety information for Cobalt(II) hydroxide

Signal word Danger
Pictogram(s)
ghs
Skull and Crossbones
Acute Toxicity
GHS06
ghs
Health Hazard
GHS08
ghs
Environment
GHS09
GHS Hazard Statements H302:Acute toxicity,oral
H317:Sensitisation, Skin
H319:Serious eye damage/eye irritation
H330:Acute toxicity,inhalation
H334:Sensitisation, respiratory
H350:Carcinogenicity
H360:Reproductive toxicity
H410:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes P273:Avoid release to the environment.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.
P302+P352:IF ON SKIN: wash with plenty of soap and water.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Computed Descriptors for Cobalt(II) hydroxide

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