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17093 Sigma-Aldrich

Ammonium hydroxide solution

puriss. p.a. plus, ≥25% NH3 in H2O

Synonym: Ammonia aqueous, Ammonia water

  • CAS Number 1336-21-6

  • Linear Formula NH4OH

  • Molecular Weight 35.05

  •  Beilstein/REAXYS Number 3587154

  •  MDL number MFCD00066650

  •  eCl@ss 38060103

  •  PubChem Substance ID 329751483

  •  NACRES NA.21



Related Categories A-B, Puriss p.a., Acids & Bases, Analytical Reagents, Analytical Reagents for General Use, Analytical/Chromatography,
Quality Level   100
grade   puriss. p.a. plus
expl. lim.   27 %
concentration   ≥25% NH3 in H2O
evapn. residue   ≤0.001%
density   0.91 g/mL at 20 °C
  0.9 g/mL at 25 °C (lit.)
anion traces   chloride (Cl-): ≤0.2 mg/kg
  phosphate (PO43-): ≤0.2 mg/kg
  sulfate (SO42-): ≤1 mg/kg
cation traces   Ag: ≤0.01 mg/kg
  As, Sb (as As): ≤0.01 mg/kg
  Au: ≤0.01 mg/kg
  B: ≤0.01 mg/kg
  Ba: ≤0.01 mg/kg
  Be: ≤0.01 mg/kg
  Bi: ≤0.01 mg/kg
  Ca: ≤0.01 mg/kg
  Cd: ≤0.01 mg/kg
  Co: ≤0.01 mg/kg
  Cr: ≤0.01 mg/kg
  Cs: ≤0.01 mg/kg
  Cu: ≤0.01 mg/kg
  Fe: ≤0.01 mg/kg
  Ga: ≤0.01 mg/kg
  Ge: ≤0.01 mg/kg
  In: ≤0.01 mg/kg
  K: ≤0.01 mg/kg
  Li: ≤0.01 mg/kg
  Mg: ≤0.01 mg/kg
  Mn: ≤0.01 mg/kg
  Mo: ≤0.01 mg/kg
  Na: ≤0.01 mg/kg
  Ni: ≤0.01 mg/kg
  Pb: ≤0.01 mg/kg
  Pt: ≤0.01 mg/kg
  Sn: ≤0.01 mg/kg
  Sr: ≤0.01 mg/kg
  Ti: ≤0.01 mg/kg
  Tl: ≤0.01 mg/kg
  V: ≤0.01 mg/kg
  Zn: ≤0.01 mg/kg
  Zr: ≤0.01 mg/kg
SMILES string   [NH4+].[OH-]
storage temp.   2-8°C
InChI   1S/H3N.H2O/h1H3;1H2


General description

Ammonium hydroxide is a weak base mainly used as a source to prepare other ammonium compounds like urea, ammonium carbonate and ammonium sulfate etc.

Ammonium hydroxide solution is a solution of 30-33% NH3 in H2O. It is a colorless liquid having a strong characteristic odor. Electrolytic deposition of silver onto vitreous carbon electrodes from ammonium hydroxide solutions by the potential step technique has been reported.


Ammonium hydroxide solution may be used in the following studies:
• Preparation of magnetic nanoparticles.
• To investigate the effect of substrate on the morphology of ZnS thin films by chemical bath deposition.
• Preparation of amine functionalized cellulose nanocrystals (CNC-NH2).
• Wet processing of the GaAs(100) surface.

Ammonium hydroxide solution may be used:
• As a medium to prepare magnetite (Fe3O4) nanoparticles via a modified controlled chemical coprecipitation method.
• As a solvent and reagent to prepare 4-aryl and 4-alkyl-2,6-dimethyl-1,4-dihydro-3,5-pyridinedicarboxylates via Hantzsch synthesis in a microwave cavity synthesizer.

Safety & Documentation

Safety Information

Signal word 
Hazard statements 
Target organs 
Respiratory system
UN 2672 8 / PGIII
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Protocols & Articles

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