Ammonium bisulfate

Ammonium bisulfate

Names
IUPAC name Ammonium hydrogen sulfate
Identifiers
CAS Number	7803-63-6 Y
3D model (Jmol)	Interactive image
ChemSpider	23057 Y
ECHA InfoCard	100.029.332
PubChem	16211166
RTECS number	WS990000
UNII	8MW949D9GE N
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
SMILES [O-]S(=O)(=O)O.[NH4+]
Properties
Chemical formula	(NH4)HSO4
Molar mass	115.11 g/mol
Appearance	White solid
Density	1.78 g/cm3
Melting point	147 °C (297 °F; 420 K)
Solubility in water	Very soluble
Solubility in other solvents	Soluble in methanol insoluble in acetone
Hazards
Safety data sheet	External MSDS
NFPA 704	0 3 0
Related compounds
Other anions	Ammonium thiosulfate Ammonium sulfite Ammonium sulfate Ammonium persulfate
Other cations	Sodium bisulfate Potassium bisulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Ammonium bisulfate, also known as ammonium hydrogen sulfate, is a white, crystalline solid with the formula (NH₄)HSO₄. It is the product of the half-neutralization of sulfuric acid by ammonia.

It is commonly collected as a byproduct of the "acetone cyanohydrin route" to the commodity chemical methyl methacrylate.

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

It also arises by the thermal decomposition of ammonium sulfate:

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.