K2CrO4 – Potassium Chromate Solution 1 Molar
Potassium chromate is the inorganic compound with the formula K2CrO4. This yellow solid is the potassium salt of the chromate anion.
Safety
As with other Cr(VI) compounds, potassium chromate is carcinogenic. Positive associations with lung cancer at a very high rate, and nasal / sinus cancer at a 100x lower rate than lung cancer have been found using worker exposure data. In general, less soluble chromates are a larger chronic hazard as they can be encapsulated in the lung without being absorbed and excreted, giving more time for reactive intermediates to be produced. Animal data indicates a potential for impaired fertility, heritable genetic damage and harm to unborn children, along with other types of cancer via less common exposure routes.
As a highly soluble hexavalent chromium compound, potassium chromate is also acutely toxic, though it is poorly absorbed from the intestinal tract. The compound is also corrosive and exposure may produce severe eye damage or blindness.
| UN No: 3287 P4982/R4 Hazard Class: 6.1 Packing Group: III HS No: 28415000 EINECS: 232-140-5 CAS No: 7789-00-6 Safety data sheet (SDS) |
| Names | |
|---|---|
| IUPAC namePotassium chromate | |
| Other namesChromic acid, dipotassium salt | |
| Identifiers | |
| CAS Number | 7789-00-6 |
| 3D model (JSmol) | Interactive image |
| ChEBI | CHEBI:75249 |
| ChemSpider | 22999 |
| ECHA InfoCard | 100.029.218 |
| EC Number | 232-140-5 |
| PubChem CID | 24597 |
| RTECS number | GB2940000 |
| UNII | 5P0R38CN2X |
| UN number | 3077 |
| CompTox Dashboard (EPA) | DTXSID8064858 |
InChI | |
| SMILES | |
| Properties | |
| Chemical formula | K2CrO4 |
| Molar mass | 194.189 g·mol−1 |
| Appearance | Yellow orthorhombic crystals |
| Odor | odorless |
| Density | 2.73 g/cm3 |
| Melting point | 975 °C (1,787 °F; 1,248 K) |
| Solubility in water | 65.0 g/100 mL |
| Magnetic susceptibility (χ) | −3.9×10−6 cm3/mol |
| Refractive index (nD) | 1.74 |
| Structure | |
| Crystal structure | hexagonal (α-form, above 666 °C (1,231 °F; 939 K))rhombic (β-form, common) |
| Hazards | |
| GHS labelling:[4] | |
| Pictograms | |
| Signal word | Danger |
| Hazard statements | H315, H317, H319, H335, H340, H350, H410 |
| Precautionary statements | P201, P202, P261, P264, P271, P272, P273, P280, P302+P352, P304+P340+P312, P305+P351+P338, P308+P313, P333+P313, P337+P313, P362, P391, P403+P233, P405, P501 |
| NFPA 704 (fire diamond) | [3] 200 |
