Ammonia solution 25 % is an aqueous ammonia reagent in pharmacopoeia quality (Ph.Eur.) for laboratory use. It corresponds to the empirical composition NH₃ + H₂O, with a molar mass of 17,03 + aq g/mol, a density of 0,907 g/cm³ and a boiling point of 38 °C. The product is identified by CAS number 1336-21-6 and EG number 215-647-6, and is classified under UN number 2672 for transport. Eur.-grade ammonia. Typical laboratory uses include pH adjustment, precipitation steps, complex formation and preparation of buffer or reagent mixtures where a defined aqueous ammonia concentration is required. This ammonia solution from manufacturer Carl ROTH belongs to the acids and bases range in pharmacopoeia quality and supports analytical and preparative workflows that demand documented composition and clear physical data. The glass packaging is appropriate for storage and dispensing of this alkaline aqueous reagent in controlled laboratory environments. This article is part of pH electrodes & sensors, in pH & electrochemistry. Key features Assay (acidim.): 25,0-27,0 % Appearance of solution: complies Pyridine and homologues: ≤0,0002 % KMnO4 reducing substances: complies Carbonate: ≤0,005 % Chloride (Cl): ≤0,0001 % Sulphate (SO4): ≤0,0005 % Iron (Fe): ≤0,000025 % Non volatile matter: ≤0,002 % CAS number: 1336-21-6 Pack sizes: 1 l, 2.5 l, 10 l, 5 l EG nr.: 215-647-6 Density: 0,907 g/cm³ Concentration: 25 % Technical Information Sheet: Safety Data Sheet:
