Functional Roles
Industries Served
Physical Properties
physical_description
Dry Powder, Liquid; Pellets or Large Crystals; Pellets or Large Crystals, Liquid; Other Solid; Liquid; Water or Solvent Wet Solid; Dry Powder; Dry Powder, Pellets or Large Crystals, Liquid
color/form
Brownish gray to white crystals according to degree of purity
odor
Odorless
melting_point
280 u00b0C (decomposes)
solubility
Solubility decreases with addition of ammonia: at 10 u00b0C, from 73 g in 100 g of water, to 18 g in 100 g of 24.5% aqueous ammonia
density
1.78 at 59 u00b0F (USCG, 1999) - Denser than water; will sink
vapor_pressure
Vapor pressure of saturated solution: 0.901 kPa at 10 u00b0C; 1.319 kPa at 15 u00b0C; 1.871 kPa at 20 u00b0C; 2.573 kPa at 25 u00b0C; 3.439 kPa at 30 u00b0C; 4.474 kPa at 35 u00b0C
stability/shelf_life
Stable under recommended storage conditions.
autoignition_temperature
Not flammable (USCG, 1999)
decomposition
On heating in an open system, the compound begins to decompose at about 150 u00b0C, yielding ammonium bisulfate (NH4HSO4), and releasing ammonia.
corrosivity
Does not attack iron or aluminum /Ammoniacal solutions/
ph
pH = 5.5 (0.1 M aqueous solution)
refractive_index
Index of refraction: 1.521, 1.523, 1.533
other_experimental_properties
Average specific heat capacity: 1.423 J/g-K at 2-55 u00b0C; heat of solution on dissolution of 1 mol in 400 mol water: +9.92 kJ at 18 u00b0C; integral heat of solution: +6.57 kJ/mol at 30 u00b0C; differential heat of solution for saturated solution: +6.07 kJ/mol at 30 u00b0C; deliquesces above 80% relative humidity
GHS / SDS Safety
Warning
Irritant
- H319 (25.6%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
- H402: Harmful to aquatic life [Hazardous to the aquatic environment, acute hazard]
- H302 (11.1%): Harmful if swallowed [Warning Acute toxicity, oral]
- H412: Harmful to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard]
- H335 (20.2%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]
- H315 (25.6%): Causes skin irritation [Warning Skin corrosion/irritation]
Chemical Identity
| CAS Number | 7783-20-2 |
| IUPAC Name | diazanium;sulfate |
| InChI Key | BFNBIHQBYMNNAN-UHFFFAOYSA-N |
| PubChem CID | 6097028 |
| INCI Name | AMMONIUM SULFATE |
Synonyms & Trade Names
Full Description
Ammonium Sulfate (NH4)2SO4 is an inorganic salt that functions as a pH adjustment agent in industrial applications. This crystalline solid is primarily utilized in agriculture and HI&I cleaning industries where precise pH control is required. With a molecular weight of 132.14 and high water solubility, it decomposes at 280°C and has a density of 1.78 g/cm³.