Sodium chromate
| Sodium chromate | |
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Sodium chromate |
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Other names
Chromic acid, (Na2CrO4), disodium salt |
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| Identifiers | |
| CAS number | 7775-11-3  |
| PubChem | 24488 |
| EC number | 231-889-5 |
| UN number | 3288 |
| RTECS number | GB2955000 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | Na2CrO4 |
| Molar mass | 161.97 g/mol |
| Appearance | yellow crystals |
| Odor | odorless |
| Density | 2.698 g/cm3 |
| Melting point |
792 °C (anhydrous) |
| Solubility in water | 53 g/100 ml (20 °C) 87.3 g/100 mL (30 °C) |
| Solubility | slightly soluble in ethanol |
| Solubility in methanol | 0.344 g/100 mL (25 °C) |
| Structure | |
| Crystal structure | orthorhombic (hexagonal above 413 °C) |
| Thermochemistry | |
| Std enthalpy of formation ΔfH |
−1329 kJ/mol |
| Hazards | |
| MSDS | ICSC 1370 |
| EU Index | 024-018-00-3 |
| EU classification | Carc. Cat. 2 Muta. Cat. 2 Repr. Cat. 2 Very toxic (T+) Harmful (Xn) Corrosive (C) Dangerous for the environment (N) |
| R-phrases | R45, R46, R60, R61, R21, R25, R26, R34, R42/43, R48/23, R50/53 |
| S-phrases | S53, S45, S60, S61 |
| NFPA 704 |
 0
3
0
OX
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| Flash point | Non-flammable |
| Related compounds | |
| Other anions | Sodium dichromate Sodium molybdate Sodium tungstate |
| Other cations | Potassium chromate Calcium chromate Barium chromate |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Sodium chromate (Na2CrO4) is a yellow solid chemical compound used as a corrosion inhibitor in the petroleum industry,[1] a dyeing auxiliary in the textile industry,[1] as a wood preservative,[2] and as a diagnostic pharmaceutical in determining red blood cell volume.[3]
It is obtained from the reaction of sodium dichromate with sodium hydroxide. It is hygroscopic and can form tetra-, hexa-, and decahydrates. Sodium chromate, like other hexavalent chromium compounds, is toxic and carcinogenic.[1]
The substance is a strong oxidant. It is soluble in water,[4] producing a weakly basic solution.[5]
See also [edit]
References [edit]
- ^ a b c Gerd Anger, Jost Halstenberg, Klaus Hochgeschwender, Christoph Scherhag, Ulrich Korallus, Herbert Knopf, Peter Schmidt, Manfred Ohlinger (2005), "Chromium Compounds", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a07_067
- ^ "Sodium chromate - Pesticide use statistics for 2005". PAN Pesticides Database. Retrieved 2008-06-20.
- ^ Bracco Diagnostics Inc. "chromitope sodium (Sodium Chromate, Cr 51) injection, solution". DailyMed. Retrieved 2008-06-20.
- ^ "Sodium chromate". inchem. Retrieved 2008-06-20.
- ^ Record of Sodium chromate in the GESTIS Substance Database from the IFA
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