Substance profile
Thiocyanic Acid
Thiocyanic Acid: colourless liquid.
01 · Identification
What Thiocyanic Acid is
Thiocyanic Acid: colourless liquid. Its molecular formula is CHNS and its molecular weight is 59.09 g/mol. It melts at 5 °C.
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 |
|---|---|
| H332 | Harmful if inhaled. |
| H312 | Harmful in contact with skin. |
| H302 | Harmful if swallowed. |
| H412 | Harmful to aquatic life with long lasting effects. |
Supplemental EU statements: EUH032
Precautionary statements: P260, P270, P271, P273, P280, P301, P302, P304, P312, P330, P352, P501
03 · Physical and chemical properties
Thiocyanic Acid 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 | 5 °C (41 °F) | ICSC | |
| Solubility | Solubility in water: good | ICSC | |
| Vapor pressure | 4.73 mmHg | Haz-Map | |
| Vapor density | 2 (air = 1) | ICSC |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.