Substance profile
Cobalt sulfide
Cobalt sulfide is a black amorphous powder.
01 · Identification
What Cobalt sulfide is
Cobalt sulfide is a black amorphous powder. It melts at 1117 °C, is practically insoluble in water.
Under the GHS it carries the signal word Warning.
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H317 | May cause an allergic skin reaction. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P261, P272, P273, P280, P313, P333, P391, P501
03 · Physical and chemical properties
Cobalt sulfide properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 1117 °C (2042.6 °F) | HSDB | |
| 1116 °C (2040.8 °F) | above this value | ICSC | |
| Density | 5.45 g/cm³ | HSDB | |
| 5.5 g/cm³ | ICSC | ||
| Solubility | Insoluble in water | HSDB | |
| 0.00038 g/100 cc H2O at 18 °C | at 18 °C | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Source notes
Further notes on Cobalt sulfide
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
Solubility
Using OECD Guideline 105 (Water Solubility), the water solubility of cobalt monosulfide at 21 to 23 °C and pH 6 varied with loading concentration and dissolution time. Under the conditions of this test, the dissolution of CoS is 103.7 ug/L for a 28-day endpoint (1 mg/L loading), 11362.4 ug/L for a 7-day endpoint (10 mg/L loading) and 7666.8 ug/L for a 7-day endpoint (100 mg/L loading).
Source: HSDB