Ammonium bisulfate

Ammonium bisulfate
IUPAC name Ammonium hydrogen sulfate
Identifiers
CAS number	7803-63-6 Y
PubChem	16211166
ChemSpider	23057 Y
RTECS number	WS990000
Jmol-3D images	Image 1
SMILES [O-]S(=O)(=O)O.[NH4+]
InChI InChI=1S/H3N.H2O4S/c;1-5(2,3)4/h1H3;(H2,1,2,3,4) Y Key: BIGPRXCJEDHCLP-UHFFFAOYSA-N Y InChI=1/H3N.H2O4S/c;1-5(2,3)4/h1H3;(H2,1,2,3,4) Key: BIGPRXCJEDHCLP-UHFFFAOYAA
Properties
Molecular formula	(NH4)HSO4
Molar mass	115.11 g/mol
Appearance	White solid
Density	1.78 g/cm3
Melting point	147 °C, 420 K, 297 °F
Solubility in water	Very soluble
Solubility in other solvents	Soluble in methanol insoluble in acetone
Hazards
MSDS	External MSDS
EU Index	Not listed
NFPA 704	0 3 0
Related compounds
Other anions	Ammonium thiosulfate Ammonium sulfite Ammonium sulfate Ammonium persulfate
Other cations	Sodium bisulfate Potassium bisulfate
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Ammonium bisulfate, also known as ammonium hydrogen sulfate, is a white, crystalline solid when it is completely pure, with formula (NH₄)HSO₄.

Production

It is commonly collected as a byproduct of flue-gas desulfurization, formed by partial neutralization of sulfuric acid (H₂SO₄) aerosols by gaseous ammonia, NH₃.

It can also be obtained by hydrolysis of sulfamic acid in aqueous solution, which produces the salt in high purity:

H₃NSO₃ + H₂O → [NH₄]⁺[HSO₄]^-

Applications

Indeed, the solid material can collect on and foul solid surfaces in the flues. It is too acidic for most end uses, and is corrosive to the skin. It can be further neutralized with ammonia to form ammonium sulfate, a valuable fertilizer.

It can be used as a weaker alternative to sulfuric acid, although sodium bisulfate is much more common.

This inorganic compound-related article is a stub. You can help Wikipedia by expanding it. v t e