Names | |
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IUPAC name
Sodium dihydrogen arsorate
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Other names
sodium arsenate monobasic, sodium dihydroarsenate
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Identifiers | |
3D model (
JSmol)
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PubChem
CID
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CompTox Dashboard (
EPA)
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Properties | |
NaH4AsO5 (monohydrate) | |
Molar mass | 181.9 g/mol |
Appearance | colourless solid |
Density | 2.53 g/cm3 |
slightly soluble | |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
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toxic |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
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Sodium dihydrogen arsenate is the inorganic compound with the formula NaH2AsO4. Related salts are also called sodium arsenate, including Na2HAsO4 ( disodium hydrogen arsenate) and NaH2AsO4 (sodium dihydrogen arsenate). Sodium dihydrogen arsenate is a colorless solid that is highly toxic.
The salt is the conjugate base of arsenic acid:
In the laboratory, it is prepared in this way, crystallizing from a hot saturated aqueous solution, where it is highly soluble when hot (75.3 g in 100 mL at 100 °C). It is obtained as the monohydrate.
Upon heating, solid NaH2AsO4H2O, loses water of crystallization and converts to the pyroarsenate salt Na2H2As2O7. [1]