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| IUPAC name
Ammonium hydrogen sulfite
| Other names
Azanium hydrogen sulfite
Sulfurous acid, ammonium salt (1:1)
|Molar mass||99.104 g/mol|
|Appearance||Colorless to yellowish solid|
|Odor||Poignant, sulfur dioxide|
|Density||2.03 g/cm3 (at 20 °C) (72% aq. sol.)|
|Melting point||50–60 °C (122–140 °F; 323–333 K) (decomposes)|
|Boiling point||147–150 °C (297–302 °F; 420–423 K) (sublimes)|
| 71.8 g/100 ml (0 °C)|
267 g/100 ml (10 °C)
620 g/100 ml (60 °C)
|Solubility|| Reacts with HCl 37%|
Insoluble in toluene
|Safety data sheet||Hydrite (70%)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Ammonium bisulfite is an inorganic compound, with the formula NH4HSO3. It is a pale yellow solid, which emits toxic sulfur dioxide fumes at standard conditions.
Ammonium bisulfite will slowly oxidize in air to ammonium bisulfate:
- NH4HSO3 + ½ O2 → NH4HSO4
Addition of excess ammonia will give ammonium sulfite.
- NH4HSO3 + NH3 → (NH4)2SO3
Ammonium bisulfite is an unstable white-yellowish solid, soluble in water, which gives off sulfur dioxide vapors upon standing, giving it a very unpleasant odor.
Ammonium bisulfite is available as aqueous solution, though due to its hazards it's best to make it yourself.
- Reducing agent
Ammonium bisulfite is irritant and toxic. Should be handled with proper protection, in well ventilated areas.
In closed bottles, away from metals, in well ventilated areas. Do not store for long.
Can be neutralized with hydrogen peroxide to ammonium bisulfate and if necessary with excess ammonia to ammonium sulfate.
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