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.

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