Cobalt(II) hydroxide , 98% , 21041-93-0
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
| Pack Size | Price | Stock | Quantity |
| 25g | RMB50.40 | In Stock |
|
| 100G | RMB122.40 | In Stock |
|
| 500G | RMB484.00 | In Stock |
|
| 25kg | RMB7600.00 | In Stock |
|
| others | Enquire |
PRODUCT Properties
| 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) |
Description and Uses
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.
Cobalt salts, paint and varnish driers, catalyst, storage-battery electrodes.
Safety
| Symbol(GHS) |    GHS06,GHS08,GHS09 |
| Signal word | Danger |
| Hazard statements | H302-H317-H319-H330-H334-H350-H360-H410 |
| Precautionary statements | P273-P280-P301+P312-P302+P352-P304+P340+P310-P305+P351+P338 |
| 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 |
