Ammonium Sulfate

Title: Ammonium Sulfate
CAS Registry Number: 7783-20-2
CAS Name: Sulfuric acid diammonium salt
Additional Names: mascagnite
Molecular Formula: H8N2O4S
Molecular Weight: 132.14
Percent Composition: H 6.10%, N 21.20%, O 48.43%, S 24.27%
Line Formula: (NH4)2SO4
Literature References: The "pure" grade of commerce contains at least 99% (NH4)2SO4. Prepn: Gmelins, Ammonium (8th ed.) 23, 261-280 (1936). Manuf: Faith, Keyes & Clark's Industrial Chemicals, F. A. Lowenheim, M. K. Moran, Eds. (Wiley-Interscience, New York, 4th ed., 1975) pp 103-108. Review: Call, "Ammonium Sulfate" in Mellor's Vol. VIII, Supplement I, Nitrogen (part 1) 473-505 (1964). Solubility studies: A. C. D. Rivett, J. Chem. Soc. 121, 379 (1922); R. M. Caven, T. C. Mitchell, ibid. 125, 1428 (1924).
Properties: Odorless, orthorhombic crystals or white granules. d 1.77. Dec above 280°. Soly in water (g (NH4)2SO4 per 100 g of satd soln): 41.22 (0°); 43.47 (25°); 50.42 (100°) (Rivett). Soly in water (g/100 g H2O): 70.6 (0°); 76.7 (25°); 103.8 (100°) (Caven, Mitchell). Insol in alcohol, acetone. pH of 0.1 molar aq soln 5.5.
Density: d 1.77
Use: Manuf ammonia alum; in the manuf of H2SO4 to free it from nitrogen oxides; analytical uses; freezing mixtures, flameproofing fabrics and paper; manuf viscose silk; tanning, galvanizing iron; in fractionation of proteins. The commercial grade is used as fertilizer.
Ammonium Sulfide Ammonium Sulfide Solution, Red Ammonium Sulfide Solution, Yellow Ammonium Sulfite Ammonium Tetrachloroaluminate

Ammonium sulfate
Ammonium sulfate.png
Ball-and-stick model of two ammonium cations and one sulfate anion
Identifiers
CAS number 7783-20-2 YesY
ChemSpider 22944 YesY
UNII SU46BAM238 YesY
KEGG D08853 YesY
Jmol-3D images Image 1
Properties
Molecular formula (NH4)2SO4
Molar mass 132.14 g/mol
Appearance Fine white hygroscopic granules or crystals.
Density 1.769 g/cm3 (20 °C)
Melting point 235 to 280 °C; 455 to 536 °F; 508 to 553 K (decomposes)
Solubility in water 70.6 g/100 mL (0 °C)

74.4 g/100 mL (20 °C)
103.8 g/100 mL (100 °C)[1]
Solubility insoluble in acetone, alcohol and ether
Critical relative humidity 79.2% (30 °C)
Hazards
EU Index Not listed
NFPA 704
NFPA 704.svg
1
2
0
Flash point Non-flammable
LD50 2840 mg/kg, rat (oral)
Related compounds
Other anions Ammonium thiosulfate
Ammonium sulfite
Ammonium bisulfate
Ammonium persulfate
Other cations Sodium sulfate
Potassium sulfate
Related compounds Ammonium iron(II) sulfate
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Ammonium sulfate (IUPAC-recommended spelling; also ammonium sulphate in British English), (NH4)2SO4, is an inorganic salt with a number of commercial uses. The most common use is as a soil fertilizer. It contains 21% nitrogen as ammonium cations, and 24% sulfur as sulfate anions.