Ammonium sulfate
Ammonium sulfate is an inorganic sulfate salt obtained by reaction of sulfuric acid with two equivalents of ammonia. A high-melting (decomposes above 280C) white solid which is very soluble in water (70.6 g/100 g water at 0C; 103.8 g/100 g water at 100C), it is widely used as a fertilizer for alkaline soils. It has a role as a NMR chemical shift reference compound and a fertilizer. It is an inorganic sulfate salt and an ammonium salt.
IUPAC: diazanium;sulfate
PubChem
Physical & Chemical Properties
| Melting Point | 280 °C (decomposes) |
| Density | 1.78 at 59 °F (USCG, 1999) - Denser than water; will sink |
| Solubility | Freely soluble in water, insoluble in ethanol |
| Vapor Pressure | Vapor pressure of saturated solution: 0.901 kPa at 10 °C; 1.319 kPa at 15 °C; 1.871 kPa at 20 °C; 2.573 kPa at 25 °C; 3.439 kPa at 30 °C; 4.474 kPa at 35 °C |
| pH | pH = 5.5 (0.1 M aqueous solution) |
| Appearance | Ammonium sulfate is a white odorless solid. Sinks and dissolves in water. (USCG, 1999) |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
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HS Code(s): 3102
Data: UN Comtrade
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