Ammonia water (Ammonium hydroxide, NH₃・H₂O) is a weakly alkaline aqueous solution formed by dissolving ammonia gas in water. It serves as an important chemical raw material and agricultural nitrogen fertilizer, featuring strong volatility, pungent odor and corrosiveness.
Physical & Chemical Properties
Molecular FormulaNH4OH
Density:0.9g/cm³g/cm³
Boiling Point:38℃
Solubility:
Soluble freely in water and ethanol.
Molecular Weight:35.1g/mol
Flash Point:
Melting Point:-58℃
Uses
1. Agriculture
Nitrogen fertilizer: Direct application or irrigation after dilution to provide available nitrogen and promote crop growth.
Soil improvement: Adjust pH value of acidic soil.
2. Industry
Chemical raw material: Used for manufacturing ammonium salts (ammonium chloride, ammonium sulfate), organic amines and pharmaceutical intermediates.
Textile printing and dyeing: Wool and silk washing, color fixation, and pH adjustment of dye liquor.
Metal processing: Cleaning, passivation and etching of metals such as copper and aluminum.
Environmental protection: Flue gas desulfurization and denitrification, sewage treatment (neutralization of acidic wastewater).
Laboratory: Commonly used as weak alkali reagent, ammonia source, for silver mirror reaction, etc.
Safety, Security & Risk
Chemical Hazards
It reacts with many heavy metals and heavy metal salts to form explosive compounds.Corrosive to numerous metals, generating flammable and explosive gases.Violent reaction occurs upon contact with acids, presenting risks of fire and explosion.When heated, it decomposes and releases toxic, corrosive fumes containing ammonia and nitrogen oxides, which may cause poisoning hazards.