Potassium arsenate
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| Potassium arsenate | |
|---|---|
| IUPAC name | Potassium dihydrogen arsenate |
| Other names | Potassium arsenate |
| Identifiers | |
| CAS number | [7784-41-0] |
| PubChem | |
| Properties | |
| Molecular formula | KH2AsO4 |
| Molar mass | 180.03 |
| Appearance | colourless solid |
| Melting point |
277-283 °C |
| Hazards | |
| Main hazards | toxic |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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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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