Structure via PubChem · Public domain (PubChem)
sodium dichromate
Sign in to saveAlso known as Disodium salt, sodium bichromate, Natriumdichromat, bichromate of soda, Natriumdichromat(VI), dichromic acid, disodium salt, Na2Cr2O7, Na2[Cr2O7]
chemical compound
Chemical data
- Formula
- Cr2Na2O7
- Molecular weight
- 261.97 g/mol
- IUPAC name
- disodium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium
- SMILES
- [O-][Cr](=O)(=O)O[Cr](=O)(=O)[O-].[Na+].[Na+]
- InChIKey
- KIEOKOFEPABQKJ-UHFFFAOYSA-N
- Polar surface area
- 124 Ų
- H-bond donors
- 0
- H-bond acceptors
- 7
- Formal charge
- 0
via PubChem
Wikidata facts
- Subclass of
- chemical compound
- Has part
- chromium
- Mass
- 261.825
- Image
- Dichroman sodný.JPG
Show 8 more facts
- 2022 Harmonized System Code
- 284130
- canonical SMILES
- [O-][Cr](=O)(=O)O[Cr](=O)(=O)[O-].[Na+].[Na+]
- Commons category
- Sodium dichromate
- chemical formula
- Cr₂Na₂O₇
- density
- 2.52
- melting point
- 356.71
- decomposition point
- 400
- standard enthalpy of formation
- -1962
Sources (3)
via Wikidata · CC0
~5 min read
Encyclopedic overview
Sodium dichromate is the inorganic compound with the formula Na2Cr2O7. However, the salt is usually handled as its dihydrate Na2Cr2O7·2H2O. Virtually all chromium ore is processed via conversion to sodium dichromate and virtually all compounds and materials based on chromium are prepared from this salt. In terms of reactivity and appearance, sodium dichromate and potassium dichromate are very similar. The sodium salt is, however, 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.
Preparation
Excerpted from Wikipedia’s “sodium dichromate” article, available under the CC BY-SA 4.0 licence.