Sodium arsenate

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Structural formula
3.svg Sodium ion Structure of the arsenate ion
General
Surname Sodium arsenate
other names

Arsenic acid sodium salt

Molecular formula Na 3 AsO 4
Brief description

colorless and odorless solid

External identifiers / databases
CAS number
  • 13464-38-5
  • 7631-89-2 (unspecified salt)
PubChem 47275
Wikidata Q2336340
properties
Molar mass 207.89 g mol −1
Physical state

firmly

density
  • 1.87 g cm −3
  • 1.75-1.80 (dodecahydrate at 25 ° C)
Melting point

86 ° C

solubility
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary
06 - Toxic or very toxic 08 - Dangerous to health 09 - Dangerous for the environment

danger

H and P phrases H: 350-331-301-410
P: ?
MAK

Switzerland: 0.01 mg m −3 (based on arsenic, measured as inhalable dust )

As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Sodium arsenate is a chemical compound of sodium from the group of arsenates . According to some sources, the compound with the composition AsH 3 O 4 · xNa is not precisely specified.

Extraction and presentation

Sodium arsenate can be obtained by reacting arsenic trioxide with sodium nitrate .

properties

Sodium arsenate is a crystalline, colorless and odorless solid that is soluble in water. It decomposes when heated above 180 ° C. Its structure (as dodecahydrate) is isomorphic to that of sodium phosphate . It has a hexagonal crystal structure with the space group P 3 c 1 (space group no. 165) . Template: room group / 165

use

Sodium arsenate is used as an insecticide in wood preservatives and ant baits .

Related links

Individual evidence

  1. ↑ a b c d e f UK Poison Information Documents (UKPID) for Sodium arsenate , accessed October 16, 2016.
  2. ↑ a b c d e f g Entry on sodium arsenate, unspecified salt in the GESTIS substance database of the IFA , accessed on October 16, 2016(JavaScript required) .
  3. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry arsenic compounds, with the exception of those named in this appendix in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA) on February 6, 2019. Manufacturers or distributors can expand the harmonized classification and labeling .
  4. ↑ Swiss Accident Insurance Fund (Suva): Limit values ​​- current MAK and BAT values (search for arsenic and inorganic arsenic compounds ), accessed on March 4, 2020.
  5. ↑ Angel Vegas: Inorganic 3D Structures . Springer Science & Business Media, 2011, ISBN 978-3-642-20340-4 , p. 106 ( limited preview in Google Book search).
  6. ↑ R. Blachnik: Pocket book for chemists and physicists Volume 3: Elements, inorganic compounds and materials, minerals . Springer-Verlag, 2013, ISBN 978-3-642-58842-6 , pp. 600 ( limited preview in Google Book Search).