Cobalt(II) hydroxide
Physical Properties Uses Preparation Reactions- Product Name
- Cobalt(II) hydroxide
- CAS No.
- 21041-93-0
- Chemical Name
- Cobalt(II) hydroxide
- Synonyms
- t(II) hydroxide;COBALT HYDROXID;Cobalt hydroxide;cobaltdihydroxide;Cobalt(II)hydroxi;cobaltoushydroxide;cobalt(2+)hydroxide;cobalt (Ⅱ) hydroxide;COBALT(II) HYDROXIDE;Cobalt(II)dihydoxide
- 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.)
- vapor pressure
- 0Pa at 20℃
- storage temp.
- Inert atmosphere,Room Temperature
- solubility
- slightly soluble in H2O; soluble in acid solutions
- form
- Powder
- Specific Gravity
- 3.597
- color
- Pink to purple
- 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
- Hazard Codes
- Xn,N
- Risk Statements
- 20/21/22-36/37/38-50/53-42/43-40-20/22
- Safety Statements
- 26-37/39-36
- RIDADR
- UN 3077 9 / PGIII
- WGK Germany
- 3
- RTECS
- GG0904500
- TSCA
- Yes
Hazard and Precautionary Statements (GHS)
- Symbol(GHS)
-
- Signal word
- Danger
- Hazard statements
-
H302Harmful if swallowed
H317May cause an allergic skin reaction
H319Causes serious eye irritation
H330Fatal if inhaled
H334May cause allergy or asthma symptoms or breathing difficulties if inhaled
H350May cause cancer
H360May damage fertility or the unborn child
H410Very toxic to aquatic life with long lasting effects
- Precautionary statements
-
P273Avoid release to the environment.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.
P302+P352IF ON SKIN: wash with plenty of soap and water.
P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
N-Bromosuccinimide Price
- Product number
- 342440
- Product name
- Cobalt(II) hydroxide
- Purity
- technical grade, 95%
- Packaging
- 250g
- Price
- $112
- Updated
- 2025/07/31
- Product number
- 93-2741
- Product name
- Cobalt(II) hydroxide (97%-Co)
- Packaging
- 50g
- Price
- $46
- Updated
- 2024/03/01
- Product number
- 93-2741
- Product name
- Cobalt(II) hydroxide (97%-Co)
- Packaging
- 250g
- Price
- $184
- Updated
- 2024/03/01
- Product number
- 30771
- Product name
- COBALTHYDROXIDE,95%
- Packaging
- 100g
- Price
- $46.69
- Updated
- 2021/12/16
- Product number
- 30772
- Product name
- COBALTHYDROXIDE,95%
- Packaging
- 500g
- Price
- $165.59
- Updated
- 2021/12/16
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.
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.
Flammability and Explosibility
Not classified
Cobalt(II) hydroxide Preparation Products And Raw materials
Raw materials
Preparation Products
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View Lastest Price from Cobalt(II) hydroxide manufacturers
- Product
- Cobalt(II) hydroxide 21041-93-0
- Price
- US $0.00-0.00/KG
- Min. Order
- 1KG
- Purity
- 98
- Supply Ability
- 10000KGS
- Release date
- 2025-12-04
- Product
- Cobalt Hydroxide 21041-93-0
- Price
- US $79.00-38.00/kg
- Min. Order
- 1kg
- Purity
- 99%
- Supply Ability
- 20ton
- Release date
- 2024-12-24
- Product
- Cobalt(II) hydroxide 21041-93-0
- Price
- US $0.00-0.00/KG
- Min. Order
- 1KG
- Purity
- 99%
- Supply Ability
- 500000kg
- Release date
- 2024-10-30