Sodium arsenate
| Names | |
|---|---|
| IUPAC name
Potassium dihydrogen arsenate
| |
| Other names
Potassium arsenate
| |
| Identifiers | |
| ECHA InfoCard | 100.033.334 |
| RTECS number |
|
CompTox Dashboard (EPA)
|
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| Properties | |
| KH2AsO4 | |
| Molar mass | 180.033 g/mol |
| Appearance | colourless solid |
| Density | 2.867 g/cm3 |
| Melting point | 280 °C |
| slightly soluble | |
Refractive index (nD)
|
1.5723 |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
|
toxic |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Potassium arsenate is the chemical compound with the formula KH2AsO4. Other salts are also called potassium arsenate, including K2HAsO4 and K3AsO4. Each of these species is derived from arsenic acid:
- H3AsO4 + KOH → KH2AsO4 + H2O
- KH2AsO4 + KOH → K2HAsO4 + H2O
- K2HAsO4 + KOH → K3AsO4 + H2O
These species are closely related to the corresponding potassium phosphates. The anions H2AsO4−, HAsO42−, and AsO43− feature tetrahedral AsO4 with two, one, or no H atoms attached to the oxygen atom(s), respectively.
Although this and related arsenic salts have been prescribed for health purposes, such compounds are highly toxic.
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