| IUPAC name
| Other names
|Molar mass||164.14 g/mol|
|Appearance||White crystalline solid|
|Density||1.88 g/cm3 (20 °C)|
|Melting point||120 °C (248 °F; 393 K) (decomposes)|
|58.7 g/100 ml (20 °C)|
|Safety data sheet||Sigma-Aldrich|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
|842 mg/kg (rat, oral)|
| Hydroxylammonium chloride|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Hydroxylammonium sulfate is the sulfuric acid salt of hydroxylamine with the chemical formula (NH3OH)2SO4.
- 2 (NH3OH)2SO4 → 2 SO3 + N2O + 2 NH3 + 5 H2O
Hydroxylammonium sulfate is a white solid, soluble in water.
Hydroxylammonium sulfate is sold by chemical suppliers.
- HNO2 + 2 KHSO3 → (KSO3)2NOH + H2O
- 2 (KSO3)2NOH + 4 H2O → (NH3OH)2SO4 + 2 K2SO4 + H2SO4
- Preparation of oximes and hydroxamic acids
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.
Should be kept in closed plastic bottles.
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.