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Acids and bases

Ammonia vs ammonium hydroxide

Ammonia (H3N, CAS 7664-41-7) and ammonium hydroxide (H5NO, CAS 1336-21-6) are both listed under hydroxides and bases.

Ammonia has a molar mass of 17.03 g/mol, ammonium hydroxide 35.05 g/mol.

Measured boiling points are -33.4 °C for ammonia and 38 °C for ammonium hydroxide.

Both carry the GHS signal word Danger.

On CompoundList, 239 suppliers list ammonia and 262 suppliers list ammonium hydroxide.

Data last updated 7 October 2026

Ammonia and ammonium hydroxide compared side by side
Ammonia chemical structure, H3N, CAS 7664-41-7
Ammonia
Ammonium hydroxide chemical structure, H5NO, CAS 1336-21-6
Ammonium hydroxide
Identity
Name in our databaseAmmoniaAmmonium hydroxide
CAS number7664-41-71336-21-6
Molecular formulaH3NH5NO
Molar mass17.03 g/mol35.05 g/mol
IUPAC nameazaneazanium hydroxide
EC number231-635-3215-647-6
Physical properties
AppearanceColorless gasColorless liquid
Melting point-77.7 °C-58 °C
Boiling point-33.4 °C38 °C
DensityRelative density (water = 1): 0.7 (-33 °C)Relative density (water = 1): 0.9 (25%)
Flash point132 °CNot recorded
SolubilityIn water, 4.82 × 10⁺⁵ mg/L at 24 °CSolubility in water: miscible
LogP (octanol/water)Computed from the structure0.160.2
Safety (GHS)
Signal wordDangerDanger
Pictograms
GHS04: Gas under pressure
GHS05: Corrosive
GHS06: Acute toxicity (severe)
GHS09: Hazardous to the environment
GHS05: Corrosive
GHS09: Hazardous to the environment
Hazard statements
  • H221 Flammable gas.
  • H314 Causes severe skin burns and eye damage.
  • H331 Toxic if inhaled.
  • H400 Very toxic to aquatic life.
  • H314 Causes severe skin burns and eye damage.
  • H400 Very toxic to aquatic life.
UN numberUN 1005UN 2672
Uses and classification
Uses and functions
  • Fragrance ingredients
  • PH adjusters
  • Specialty gases
  • Lewis base
  • NMR chemical shift reference compound
  • Aetiopathogenetic role
  • Acidulants and acidity regulators
  • Additive
  • Food acidity regulator
  • Food additive
  • Food component
  • Physiological role
CategoryInorganic chemicals › Industrial gasesInorganic chemicals › Hydroxides and bases
HS code281410Anhydrous ammonia281420Ammonia in aqueous solution
Market on CompoundList
Suppliers239 suppliers262 suppliers
Supplier countries22 countries, most in United States, China, India39 countries, most in United States, India, China
Price rangeOnly prices set by suppliers who manage their own profilePrice on requestPrice on request

Measured and computed values as shown on each chemical page, plus live listings on CompoundList. Details may have changed, please confirm them with the supplier. Safety data is a summary, not an SDS.

Ammonia
Ammonium hydroxide

More comparisons

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