Sodium selenite
chemical compound
Sodium selenite is a chemical compound. Its chemical formula is Na2SeO3. It contains sodium and selenite ions.
| ||
| Identifiers | ||
|---|---|---|
| ||
3D model (JSmol)
|
||
| ChEBI | ||
| ChEMBL | ||
| ChemSpider | ||
| ECHA InfoCard | 100.030.230 | |
| EC Number |
| |
| KEGG | ||
PubChem CID
|
||
| RTECS number |
| |
| UNII | ||
| UN number | 2630 | |
CompTox Dashboard (EPA)
|
||
| ||
| Properties | ||
| Na2O3Se | ||
| Molar mass | 172.95 g·mol−1 | |
| Appearance | colorless solid | |
| Density | 3.1 g/cm3 | |
| Melting point | decomposes at 710 °C | |
| 85 g/100 mL (20 °C) | ||
| Solubility | insoluble in alcohol, ethanol | |
| Structure | ||
| tetragonal | ||
| Pharmacology | ||
| A12CE02 (WHO) | ||
| Hazards | ||
| EU classification | Very toxic (T+) Dangerous for the environment (N) | |
| NFPA 704 |
| |
| R-phrases | R23, R28, R31, R43, R51/53 | |
| S-phrases | (S1/2), S28, S36/37, S45, S61 | |
| Related compounds | ||
| Related compounds | {{{value}}} | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | ||
 verify (what is   ?)
| ||
| Infobox references | ||
Properties
changeSodium selenite is a white solid. It dissolves in water. It is a weak oxidizing agent. It reacts with acids to make selenous acid. It can be oxidized by powerful oxidizing agents to make sodium selenate.
Preparation
changeIt is made by reacting sodium hydroxide with selenium dioxide
- 2 NaOH + SeO2 → Na2SeO3 + H2O
Uses
changeSodium selenite is used to add a pink color to glass. It is also used in some vitamin supplements.
Safety
changeEating of any more than a very tiny amount would give selenium poisoning.