Hydroxylammonium sulfate
| Names | |
|---|---|
| IUPAC name
Hydroxylammonium sulfate
| |
| Other names
Bis(hydroxylammonium) sulphate
Dihydroxylammonium sulfate Hydroxylamine sulfate Hydroxyazanium sulfate | |
| Properties | |
| H8N2O6S (NH3OH)2SO4 | |
| Molar mass | 164.14 g/mol |
| Appearance | White crystalline solid |
| Odor | Odorless |
| Density | 1.88 g/cm3 (20 °C) |
| Melting point | 120 °C (248 °F; 393 K) (decomposes) |
| Boiling point | Decomposition |
| 58.7 g/100 ml (20 °C) | |
| Hazards | |
| Safety data sheet | Sigma-Aldrich |
| Flash point | Non-flammable |
| Lethal dose or concentration (LD, LC): | |
| LD50 (Median dose)
|
842 mg/kg (rat, oral) |
| Related compounds | |
| Related compounds
|
Hydroxylammonium chloride Hydroxylammonium nitrate |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Hydroxylammonium sulfate is the sulfuric acid salt of hydroxylamine with the chemical formula (NH3OH)2SO4.
Contents
Properties
Chemical
At 120 °C, hydroxylammonium sulfate begins to decompose to sulfur trioxide, nitrous oxide, water, and ammonia:
- 2 (NH3OH)2SO4 → 2 SO3 + N2O + 2 NH3 + 5 H2O
Physical
Hydroxylammonium sulfate is a white solid, soluble in water.
Availability
Hydroxylammonium sulfate is sold by chemical suppliers.
Preparation
Hydroxylammonium sulfate can be prepared by reducing acidified potassium nitrite (aka nitrous acid) with potassium bisulfite.[1]
- HNO2 + 2 KHSO3 → (KSO3)2NOH + H2O
- 2 (KSO3)2NOH + 4 H2O → (NH3OH)2SO4 + 2 K2SO4 + H2SO4
Projects
- Preparation of oximes and hydroxamic acids
Handling
Safety
Hydroxylammonium sulfate is an irritant to the respiratory tract, skin, eyes, and other mucous membranes. It is harmful if swallowed and may be absorbed through the skin. Hydroxylamine and its compounds are considered possible mutagen.
Storage
Should be kept in closed plastic bottles.
Disposal
Hydroxylammonium sulfate can be neutralized by using a ketone and then gently heating the resulting oxime, which reforms the ketone and releases nitrogen gas and water. It can also be neutralized by diluting it with water and carefully adding ferric salts or other compounds known to accelerate its decomposition.
Reduction of hydroxylamine with Zn/HCl yields ammonia.
