Sodium dichromate
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| Sodium dichromate | |
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| Systematic name | Sodium dichromate |
| Other names | hydrated sodium dichromate |
| Molecular formula | Na2Cr2O7·2H2O |
| Molar mass | 298.02 g/mol (dihydrate) |
| Density | 2.52 g/cm3 |
| Solubility (water) | 2380 g/L at 0 °C |
| Melting point | 356.7 °C dehydrates at 100 °C |
| Boiling point | decomposes |
| CAS number | [7789-12-0] |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | carcinogenic |
| NFPA 704 | |
| R/S statement | R: R45, R46, R60, R61, R8, R21, R25, R26, R34, R42/43, R48/23, R50/53, S: S53, S45, S60, S61 |
| RTECS | HX7750000 |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Related compounds | K2Cr2O7, KMnO4, CrO3 |
| Disclaimer and references | |
Sodium dichromate is the chemical compound with the formula Na2Cr2O7. Usually, however, the salt is handled as its dihydrate Na2Cr2O7·2H2O. Its chemistry, appearance, and behaviour are very similar to those of the more widely encountered potassium dichromate. This chemical is around twenty times more soluble in water than the potassium salt (49 g/L at 0 °C) and its equivalent weight is also lower, which is often desirable.[1]
This compound oxidizes benzylic and allylic C-H bonds to carbonyl derivatives.
[edit] Safety
Like all hexavalent chromium compounds, sodium dichromate is considered carcinogenic.
[edit] References
- ^ Freeman, F. "Sodium Dichromate" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. DOI: 10.1002/047084289.
[edit] External links
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