Ammonium sulfate

• CAS No:

7783-20-2

• Formula:

H3N.1/2H2O4S

• Chemical Name:

Ammonium sulfate

Description

White crystalline powder

Ammonium sulfate is a white odorless solid. Sinks and dissolves in water. (USCG, 1999)|DryPowder; DryPowder, PelletsLargeCrystals; DryPowder, PelletsLargeCrystals, Liquid; Liquid; OtherSolid; PelletsLargeCrystals; PelletsLargeCrystals, Liquid; WetSolid|White powder, shining plates or crystalline fragments

Ammonium sulfate is a white odorless solid. Sinks and dissolves in water. (USCG, 1999)|Ammonium sulfate is an inorganic sulfate salt obtained by reaction of sulfuric acid with two equivalents of ammonia. A high-melting (decomposes above 280℃) white solid which is very soluble in water (70.6 g/100 g water at 0℃; 103.8 g/100 g water at 100℃), it is widely used as a fertilizer for alkaline soils. It has a role as a fertilizer. It is an ammonium salt and an inorganic sulfate salt.|Sulfuric acid diammonium salt. It is used in CHEMICAL FRACTIONATION of proteins.

Ammonium sulfate Basic Attributes

Molecular Weight ：132.14

Exact Mass ：132.020477

EC Number ：231-984-1

UNII ：SU46BAM238

DSSTox ID ：DTXSID1029704

Color/Form ：White or brown orthorhombic crystals|Orthorhombic crystals or white granules|Brownish gray to white crystals according to degree of purity

Characteristics

PSA ：90.6

XLogP3 ：0.75190

Appearance ：Yellow to orange Solid

Density ：1.769 g/cm3 @ Temp: 50 °C

Melting Point ：336-339 °C (decomp)

Boiling Point ：330ºC at 760 mmHg

Flash Point ：26 °C

Refractive Index ：n20/D 1.396

Water Solubility ：H2O: 77 g/100 mL (25 ºC)

Storage Conditions ：2-8°C

Vapor Pressure ：<1 Pa (25 °C)

Toxicity ：Oral-rat LD50: 3000 mg/kg; Abdominal cavity-mouse LD50: 610 mg/kg

Flammability characteristics ：Flammable; heat produces toxic nitrogen oxides, sulfur oxides and ammonia fumes

Explosive limit ：May explode if mixed with oxidizers, such as potassium nitrate, potassium nitrite and potassium chlorate.

Odor ：Odorless

PH ：pH = 5.5 (0.1 M aqueous solution)

Experimental Properties ：Average specific heat capacity: 1.423 J/g-K at 2-55 °C; heat of solution on dissolution of 1 mol in 400 mol water: +9.92 kJ at 18 °C; integral heat of solution: +6.57 kJ/mol at 30 °C; differential heat of solution for saturated solution: +6.07 kJ/mol at 30 °C; deliquesces above 80% relative humidity|Decomposes above 280 °C

Air and Water Reactions ：Dissolves in water with evolution of some heat.

Reactive Group ：Salts, Acidic

Reactivity Profile ：AMMONIUM SULFATE is acidic in aqueous solution. When a little ammonium sulfate is added to fused potassium nitrite, a vigorous reaction occurs attended by flame [Mellor 2:702 1946-47].

Autoignition Temperature ：Not flammable (USCG, 1999)

Corrosivity ：Does not attack iron or aluminum /Ammoniacal solutions/

Ammonium sulfate Use

manufacture of ammonia alum; in the manufacture of H2SO4 to free it from nitrogen oxides; analytical uses; freezing mixtures, flameproofing fabrics and paper; manufacture of viscose silk; tanning, galvanizing iron; in fractionation of proteins.The commercial grade is used as fertilizer.

Agricultural chemicals (non-pesticidal)

Adhesives and sealants