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Cobalt(II) hydroxide

Physical Properties Uses Preparation Reactions
Cobalt(II) hydroxide
Cobalt(II) hydroxide structure
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 Properties

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
  • Risk and Safety Statements
Symbol(GHS) 
GHS07,GHS08,GHS09
Signal word  Danger
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
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
NFPA 704
0
2 0

Cobalt(II) hydroxide price More Price(8)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 342440 Cobalt(II) hydroxide technical grade, 95% 21041-93-0 250g $93 2021-03-22 Buy
Alfa Aesar 012524 Cobalt(II) hydroxide, 99.9% (metals basis) 21041-93-0 2kg $729 2021-03-22 Buy
Alfa Aesar 012524 Cobalt(II) hydroxide, 99.9% (metals basis) 21041-93-0 100g $47 2021-03-22 Buy
Strem Chemicals 93-2741 Cobalt(II) hydroxide (97%-Co) 21041-93-0 50g $40 2021-03-22 Buy
Strem Chemicals 93-2741 Cobalt(II) hydroxide (97%-Co) 21041-93-0 250g $157 2021-03-22 Buy

Cobalt(II) hydroxide Chemical Properties,Uses,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.

Cobalt(II) hydroxide Preparation Products And Raw materials

Raw materials

Preparation Products


Cobalt(II) hydroxide Suppliers

Global( 122)Suppliers
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SIMAGCHEM CORP
13806087780 +86 13806087780
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Hubei Jusheng Technology Co.,Ltd.
86-18871470254
027-59599243 linda@hubeijusheng.com CHINA 28229 58
Xiamen AmoyChem Co., Ltd
+86 592-605 1114
sales@amoychem.com CHINA 6369 58
HENAN BON INDUSTRIAL CO.,LTD
0371-55170695
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career henan chemical co
13203830695 0086-371-86658258
0086-371-86658258 factory@coreychem.com CHINA 29864 58
Zhuozhou Wenxi import and Export Co., Ltd
+8613111626072 (WhatsApp)
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+8613343822234 +86-0371-55052911
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View Lastest Price from Cobalt(II) hydroxide manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-08-12 Cobalt hydroxide
21041-93-0
US $15.00-10.00 / KG 1KG 99%+ HPLC Monthly supply of 1 ton Zhuozhou Wenxi import and Export Co., Ltd
2020-01-13 Cobalt(II) hydroxide
21041-93-0
US $9.80 / KG 1g ≥99% 100kg Career Henan Chemical Co

Cobalt(II) hydroxide Spectrum


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