cobalt dihydrate
Cobalt hydroxide
CAS: 21041-93-0;12672-51-4
Molecular Formula: CoH2O2
cobalt dihydrate - Names and Identifiers
| Name | Cobalt hydroxide |
| Synonyms | cobalt dihydrate Cobalt hydroxide Cobaltous hydroxide cobalt(2+)hydroxide cobalt (Ⅱ) hydroxide COBALT(II) HYDROXIDE Cobalt(II) hydroxide cobalt(2+) dihydroxide COBALT HYDROXIDE BLACK |
| CAS | 21041-93-0 12672-51-4 |
| EINECS | 244-166-4 |
| InChI | InChI=1/Co.2H2O/h;2*1H2/q+2;;/p-2 |
cobalt dihydrate - Physico-chemical Properties
| Molecular Formula | CoH2O2 |
| Molar Mass | 92.95 |
| Density | 3.597g/mLat 25°C(lit.) |
| Melting Point | °Cd ec.) |
| Boling Point | 100°C at 760 mmHg |
| Water Solubility | Soluble in acids and ammonia. Very slightly soluble in water. Insoluble in dilute alkalis. |
| Vapor Presure | 0Pa at 20℃ |
| Appearance | Powder |
| Specific Gravity | 3.597 |
| Color | Pink to purple |
| Exposure Limit | ACGIH: TWA 0.02 mg/m3 |
| Solubility Product Constant(Ksp) | pKsp: 14.23 |
| Merck | 14,2442 |
| PH | 9.15(1 mM solution);9.15(10 mM solution);9.15(100 mM solution) |
| Storage Condition | Inert atmosphere,Room Temperature |
| Stability | Stability |
| Sensitive | Air Sensitive |
| Physical and Chemical Properties | Rose-Red orthorhombic crystal or powder. Insoluble in water, soluble in acid and ammonium salt solution. |
cobalt dihydrate - Risk and Safety
| Risk Codes | R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R36/37/38 - Irritating to eyes, respiratory system and skin. R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R42/43 - May cause sensitization by inhalation and skin contact. R40 - Limited evidence of a carcinogenic effect R20/22 - Harmful by inhalation and if swallowed. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection S36 - Wear suitable protective clothing. |
| UN IDs | UN 3077 9 / PGIII |
| WGK Germany | 3 |
| RTECS | GG0904500 |
| TSCA | Yes |
cobalt dihydrate - Nature
Open Data Verified Data
rose-red orthorhombic crystal or powder. The relative density was 3. 597. Melting point of 1100~1200 ° C, heating decomposition, heating to 1600 ° C in air to lose water into cobalt oxide. Insoluble in water, soluble in acid and ammonium salt solution.
Last Update：2024-01-02 23:10:35
cobalt dihydrate - Preparation Method
Open Data Verified Data
cobalt-containing waste material method: various cobalt-containing waste materials are dissolved by nitric acid and hydrochloric acid, and the obtained cobalt chloride solution is purified with hydrogen peroxide to remove iron. If necessary, sodium carbonate or ammonia water is added to ensure complete purification. The purified cobalt chloride solution is added with sodium hydroxide to generate cobalt hydroxide, which is then washed and centrifuged to obtain a hydrogen oxidation drill product.
Last Update：2022-01-01 11:05:33
cobalt dihydrate - Use
Open Data Verified Data
desiccant for glass, enamel coloring, cobalt-based compounds, cobalt-containing catalysts, and coatings and varnishes.
Last Update：2022-01-01 11:05:32
cobalt dihydrate - Safety
Open Data Verified Data
cobalt is a biologically important element. Small doses activate many enzymes that regulate tissue respiration, hematopoiesis and other processes, and large doses inhibit the activity of these enzymes, it affects the metabolism of carbohydrates, selectively damages the endocrine part of the pancreas, affects the cardiovascular system, dilates blood vessels, lowers blood pressure, and selectively damages the myocardium. Inhalation of cobalt compounds, sometimes bronchial asthma. Ground cobalt compounds can cause acute dermatitis, sometimes with surface ulceration. The maximum allowable concentration of cobalt metal and cobalt oxide is 0.5 mg/m3. At work, you should use anti-virus masks, dust-proof work clothes and protective gloves to protect your respiratory organs and skin. In the case of exposure to metallic cobalt dust during work, it is recommended to use a paste Hand Sanitization. Attention should be paid to dust prevention and dust removal in production, and wet operation should be adopted. Packed in polyethylene plastic bags, each with a net weight of 5kg, packed in external wooden boxes. Store in a ventilated and dry place to prevent moisture and heat. Transport should be protected from rain and sun. Do not store and mix with acid and ammonium salts. When loading and unloading should be light to prevent packaging damage. When there is a fire, it can be suppressed by water, sand, and fire.
Last Update：2022-01-01 11:05:32
cobalt dihydrate - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| overview | cobalt hydroxide is a fine inorganic compound, generally rose red monoclinic or tetragonal crystal, with a relative density of 3.597(15 ℃). Soluble in acid and ammonium salt solution, insoluble in water and ethanol. Reacts with some organic acids to form cobalt-containing soap. It is easy to decompose when heated. It is heated in vacuum at 160 ℃ to dehydrate into CoO. It is more active and can also react to form a salt in a weak acid aqueous solution. When oxygen is present, it quickly reacts into a high-priced state. Generally, it is made by reacting cobalt salt with alkali metal hydroxide, or using cobalt as the anode to electrolyze salt water. Used as a raw material for cobalt salt production, as a desiccant for coatings and varnishes, a saturated liquid for batteries, a catalyst for H2O2 decomposition, etc. |
| Properties | There are two types of cobalt hydroxide, one is unstable α-type cobalt hydroxide, its color is dark green, and the other is relatively stable β cobalt hydroxide, β cobalt hydroxide is a rose red powder. The molecular formula of cobalt hydroxide is Co(OH)2, density (g/mL,25/4 ℃):3.597, insoluble in water, soluble in acid and ammonium salt solution, easily oxidized to Co(OH)3 by air or weak oxidant and turned into brown, dehydrated in vacuum to generate CoO. Fig. 1 is cobalt hydroxide structural formula |
| preparation | (2015-11-16) |
| use | used as raw material for cobalt salt production, as desiccant for coatings and varnishes, cobalt catalyst, saturated liquid for storage batteries, catalyst for H2O2 decomposition, glass lining industry as colorant, etc. for cobalt salt, cobalt catalyst, battery electrode immersion solution and paint desiccant for glass, enamel coloring, cobalt compounds, as well as paint and varnish desiccant. desiccant for manufacturing cobalt salt raw materials, coatings and varnishes, and catalyst for hydrogen peroxide decomposition. |
| Toxicity | Cobalt is an important element in biology. Small doses can activate many enzymes that regulate tissue respiration, hematopoiesis and other processes. At large doses, it inhibits the activity of these enzymes. It has an impact on carbohydrate metabolism, selectively damages the endocrine part of the pancreas, affects the cardiovascular system, dilates blood vessels, and lowers blood pressure, selective damage to the myocardium. Inhalation of cobalt compounds, sometimes bronchial asthma. Grilled cobalt compounds can cause acute dermatitis and sometimes ulceration on the surface. The maximum allowable concentration of metal cobalt and cobalt oxide is 0.5 mg/m3. Anti-virus masks, dust-proof work clothes and protective gloves should be used at work to protect respirators and skin. When exposed to metal cobalt dust at work, it is recommended to wash hands with a paste. Dust prevention and dust removal should be paid attention to in production, and wet operation should be adopted. |
| production method | cobalt-containing waste method various cobalt-containing waste materials are dissolved by nitric acid and hydrochloric acid, and the obtained cobalt chloride solution is purified with hydrogen peroxide to remove iron, and sodium carbonate or ammonia water is added if necessary to ensure complete purification. The purified cobalt chloride solution is added with sodium hydroxide to generate cobalt hydroxide, which is then washed and centrifuged to obtain cobalt hydroxide products. Its Co 2HCl → CoCl2 H2CoCl2 2NaOH → Cu(OH)2 Na2SO4 |
| category | toxic substances |
| flammability hazard characteristics | non-combustible, toxic cobalt oxide smoke emitted from the fire site |
| storage and transportation characteristics | warehouse low temperature, ventilation, drying |
| fire extinguishing agent | water, carbon dioxide, dry powder, sand |
Last Update：2024-04-10 22:29:15
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