Hydroxylammonium sulfate

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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):
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.

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.

References

  1. https://www.prepchem.com/synthesis-of-hydroxylamine-hydrochloride/

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