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Ammonia solution

Ammonia solution, also known as ammonia water, ammonium hydroxide, ammoniacal liquor, ammonia liquor, aqua ammonia, aqueous ammonia, or ammonia, is a solution of ammonia in water. It can be denoted by the symbols NH₃.

Formula: NH₄OH
Molar mass: 35,04 g/mol
Density: 880 kg/m³
Solubility in water: Miscible
Boiling point: 37.7 °C (99.9 °F; 310.8 K) (25 % w/w)
Appearance: Colourless liquid
UN number: 2672

The ammonia solution (or aqueous ammonia) comes from the dissolution of ammonia gas into water. This solution can be used directly in SNCR and SCR systems. The ammonia solution is more secure in use than anhydrous ammonia since vapor pressure is greatly reduced by the presence of water. With proper storage and proper handling, this reagent can be safely used to control NOx emissions.

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