Sodium chromate
Sodium chromate is the inorganic compound with the formula Na2CrO4. It exists as a yellow hygroscopic solid, which can form tetra-, hexa-, and decahydrates. It is an intermediate in the extraction of chromium from its ores.
| Names | |
|---|---|
| IUPAC name
Sodium chromate | |
| Other names
Chromic acid, (Na2CrO4), disodium salt Chromium disodium oxide Rachromate | |
| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.028.990 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UNII | |
| UN number | 3288 |
CompTox Dashboard (EPA) |
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| Properties | |
| Na2CrO4 | |
| Molar mass | 161.97 g/mol |
| Appearance | yellow crystals |
| Odor | odorless |
| Density | 2.698 g/cm3 |
| Melting point | 792 °C (1,458 °F; 1,065 K) (anhydrous) 20 °C (decahydrate) |
| 31.8 g/100 mL (0 °C) 84.5 g/100 mL (25 °C) 126.7 g/100 mL (100 °C) | |
| Solubility | slightly soluble in ethanol |
| Solubility in methanol | 0.344 g/100 mL (25 °C) |
| +55.0·10−6 cm3/mol | |
| Structure | |
| orthorhombic (hexagonal above 413 °C) | |
| Thermochemistry | |
Heat capacity (C) |
142.1 J/mol K |
Std molar entropy (S⦵298) |
174.5 J/mol K |
Std enthalpy of formation (ΔfH⦵298) |
−1329 kJ/mol |
Gibbs free energy (ΔfG⦵) |
-1232 kJ/mol |
| Hazards | |
| GHS labelling: | |
| Danger | |
| H301, H312, H314, H317, H330, H334, H340, H350, H360, H372, H410 | |
| P201, P202, P260, P261, P264, P270, P271, P272, P273, P280, P281, P284, P285, P301+P310, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P304+P341, P305+P351+P338, P308+P313, P310, P312, P314, P320, P321, P322, P330, P333+P313, P342+P311, P363, P391, P403+P233, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Safety data sheet (SDS) | ICSC 1370 |
| Related compounds | |
Other anions |
Sodium dichromate Sodium molybdate Sodium tungstate |
Other cations |
Potassium chromate Calcium chromate Barium chromate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
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