Names | |
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IUPAC name
Trisodium arsorate
[1]
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Other names
sodium arsenate
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Identifiers | |
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3D model (
JSmol)
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ChEBI |
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ChemSpider | |
ECHA InfoCard | 100.033.334 |
EC Number |
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PubChem
CID
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UNII |
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CompTox Dashboard (
EPA)
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Properties | |
H24Na3AsO16 (dodecahydrate) | |
Molar mass | 207.88851 g/mol |
Appearance | colourless solid |
Density | 1.517 g/cm3 (dodecahydrate) |
soluble | |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
|
toxic |
GHS labelling: | |
Danger | |
H301, H331, H350, H410 | |
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).
|
Sodium arsenate is the inorganic compound with the formula Na3AsO4. Related salts are also called sodium arsenate, including Na2HAsO4 ( disodium hydrogen arsenate) and NaH2AsO4 ( sodium dihydrogen arsenate). The trisodium salt is a white or colourless solid that is highly toxic. It is usually handled as the dodecahydrate Na3AsO4.12H2O. [2]
The compound can be obtained by neutralizing arsenic acid:
The salt (as its dodecahydrate) is isomorphous with trisodium phosphate. [3] The anion AsO43- exists at high pH, but below pH 11.5, it converts to HAsO42- (also written HOAsO32-).
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