Sodium dichromate
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| Sodium dichromate | |
|---|---|
| Image:Na2Cr2O7.png | |
| Other names | hydrated sodium dichromate |
| Identifiers | |
| CAS number | |
| RTECS number | HX7750000 |
| Properties | |
| Molecular formula | Na2Cr2O7·2H2O |
| Molar mass | 298.02 g/mol (dihydrate) |
| Density | 2.52 g/cm3 |
| Melting point |
356.7 °C |
| Boiling point |
decomposes |
| Solubility in other solvents | 2380 g/L at 0 °C |
| Hazards | |
| Main hazards | carcinogenic |
| R-phrases | R45, R46, R60, R61, R8, R21, R25, R26, R34, R42/43, R48/23, R50/53, |
| S-phrases | S53, S45, S60, S61 |
| Related Compounds | |
| Related compounds | K2Cr2O7, KMnO4, CrO3 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox 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]
Applications in organic chemistry
This compound oxidizes benzylic and allylic C-H bonds to carbonyl derivatives. For example, 2,4,6-trinitrotoluene is oxidized to the corresponding carboxylic acid.[1]. Similarly, 2,3-dimethylnaphthalene is oxidized by Na2Cr2O7 to 2,3-naphthalenedicarboxylic acid (m.p. 239–241 °C).[1]
Safety
Like all hexavalent chromium compounds, sodium dichromate is considered hazardous. It is also a known carcinogen[1].
References
ar:ثنائي كرومات صوديوم de:Natriumdichromat it:Bicromato di sodio diidrato
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
