Disodium hydrogen arsenate

Disodium hydrogen arsenate
Names
IUPAC name
Disodium hydrogen arsorate
Other names
Sodium arsenate dibasic
Identifiers
CAS Number
  • 7778-43-0 checkY
ChEBI
  • CHEBI:91256 checkY
ECHA InfoCard 100.029.002 Edit this at Wikidata
EC Number
  • 231-902-4
PubChem CID
  • 24500
UNII
  • ANU034TUJ4 checkY
CompTox Dashboard (EPA)
  • DTXSID8032047 Edit this at Wikidata
Properties
Chemical formula
 H15Na2AsO11 (heptahydrate)
Molar mass 312.01 g/mol (heptahydrate)
Appearance white solid
Solubility in water
 good
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 poison
GHS labelling:
Pictograms
 GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
Danger
Hazard statements
 H301, H331, H350, H410
Precautionary statements
 P201, P202, P261, P264, P270, P271, P273, P281, P301+P310, P304+P340, P308+P313, P311, P321, P330, P391, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound

Disodium hydrogen arsenate is the inorganic compound with the formula Na2HAsO4.7H2O. The compound consists of a salt and seven molecules of water of crystallization although for simplicity the formula usually omits the water component. The other sodium arsenates are NaH2AsO4 and Na3AsO4, the latter being called sodium arsenate. Disodium hydrogen arsenate is highly toxic. The salt is the conjugate base of arsenic acid. It is a white, water-soluble solid.[1]

Being a diprotic acid, its acid-base properties is described by two equilibria:

H
2AsO−
4 + H2O ⇌ HAsO2−
4 + H3O+  (pKa2 = 6.94)
HAsO2−
4 + H2O ⇌ AsO3−
4 + H3O+  (pKa3 = 11.5)

Related compounds

References

  1. ^ Grund, S. C.; Hanusch, K.; Wolf, H. U. "Arsenic and Arsenic Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a03_113.pub2. ISBN 978-3527306732.
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Inorganic
Halides
Chalcogenides
Pnictogenides
  • Na3N
  • NaN3
  • NaNH2
  • Na3P
  • Na3As
Oxyhalides
  • NaClO
  • NaClO2
  • NaClO3
  • NaClO4
  • NaBrO
  • NaBrO2
  • NaBrO3
  • NaBrO4
  • NaIO3
  • NaIO4
Oxychalcogenides
  • Na2SO3
  • Na2SO4
  • NaHSO3
  • NaHSO4
  • Na2S2O3
  • Na2S2O4
  • Na2S2O5
  • Na2S2O6
  • Na2S2O7
  • Na2S2O8
  • Na2SeO3
  • Na2SeO4
  • NaHSeO3
  • Na2TeO3
Oxypnictogenides
  • NaNO2
  • NaNO3
  • Na2N2O2
  • NaH2PO4
  • NaPO2H2
  • Na2HPO3
  • Na2PO3F
  • Na3PS2O2
  • Na3PO4
  • Na5P3O10
  • Na4P2O7
  • Na2H2P2O7
  • Na3AsO3
  • Na3AsO4
  • Na2HAsO4
  • NaH2AsO4
  • NaSbO3
Others
  • NaAlH4
  • NaAlO2
  • Na3AlF6
  • NaAl(SO4)2
  • NaAuCl4
  • Na2TiF6
  • NaBH4
  • NaBH3(CN)
  • NaBO2
  • Na2B4O7
  • Na2B2O9
  • Na2B8O13
  • NaBiO3
  • NaCN
  • NaCNO
  • NaCoO2
  • NaH
  • NaHCO3
  • Na4XeO6
  • NaHXeO4
  • NaMnO4
  • NaOCN
  • NaReO4
  • NaSCN
  • NaTcO3
  • NaTcO4
  • NaVO3
  • Na2CO3
  • Na2C2O4
  • Na2C3S5
  • Na2CrO4
  • Na2Cr2O7
  • Na2Cr3O10
  • Na2GeO3
  • Na2He
  • Na2[Fe(CO)4]
  • Na2MnO4
  • Na2MoO4
  • Na3IrCl6
  • Na2PtCl6
  • Na2O(UO3)2
  • Na2S4O6
  • Na2SiO3
  • Na2TiO3
  • Na2U2O7
  • Na2WO4
  • Na2Zn(OH)4
  • Na3VO4
  • Na6V10O28
  • Na4Fe(CN)6
  • Na3Fe(CN)6
  • Na3Fe(C2O4)3
  • Na4SiO4
  • Na2SiF6
  • Na3[Co(NO2)6]
  • NaNSi6
  • Na2PdCl4
Organic
  • CH3ONa
  • C2H5ONa
  • HCOONa
  • C2H5COONa
  • C3H7COONa
  • Na2C4H4O6
  • C4H5NaO6
  • NaCH3COO
  • NaC6H5CO2
  • NaC6H4(OH)CO2
  • NaC12H23O2
  • NaC10H8
  • Na2[Fe[CN5]NO]
  • C6H16AlNaO4
  • NaC6H7O6
  • C5H8NO4Na
  • C6H5Na
  • C4H9Na
  • NaC5H5
  • C15H31COONa
  • C17H33COONa
  • C18H35O2Na
  • C164H256O68S2Na2
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