Arsenic acid
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| Arsenic acid | |
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| General | |
| Systematic name | Arsenic(V) acid |
| Other names | Arsenic acid orthoarsenic acid desiccant L-10 zotox |
| Molecular formula | H3AsO4 (Solution Only) H3AsO4·½H2O (Stable Form) |
| Molar mass | 141.9429 g/mol |
| Appearance | White translucent crystals, hygroscopic. |
| CAS number | [7778-39-4] [1] |
| Properties | |
| Density and phase | 2 g/cm3, solid. |
| Solubility in water | 16.7 g/100 ml (?°C) |
| Melting point | 35.5°C (308.65 K) |
| Boiling point | 160°C (433.15 K) |
| Acidity (pKa) | ? |
| Structure | |
| Molecular shape | Planar. |
| Crystal structure | ? |
| Dipole moment | ? D |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | Highly toxic. |
| NFPA 704 | |
| Flash point | Non-flammable. |
| R/S statement | R: R26, R27, R28, R45. S: S53, S45, S60, S61. |
| RTECS number | CG0700000 |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | ? |
| Other cations | ? |
| Related compounds | Arsenous acid Arsenic pentoxide |
| 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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Arsenic acid, H3AsO4, is the acid form of arsenate ion, AsO43−, a trivalent anion. Arsenate salts behave chemically very similarly to the phosphates. Arsenic acid is only found in solution but its hemihydrate form (H3AsO4·½H2O) does form stable crystals.
[edit] Applications
Arsenic acid is used in wood treatment, finishing agent for glass and metal, in the manufacturing of dyestuffs and organic arsenic compounds and also in soil sterilant. It can moreover be used as a herbicide, insecticide or rodenticide.
[edit] See also
- Arsenous acid, H3AsO3
[edit] External links
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