Ammonia solution 25 % is an extra pure aqueous ammonia reagent with a minimum content of 25 %, CAS number 1336-21-6 and empirical formula NH₃ + H₂O. It has a molar mass of 17,03 + aq g/mol, a density of 0,907 g/cm³ and a boiling point of 38 °C, giving a well-characterised alkaline medium for everyday laboratory work. The preparation is supplied in a practical that supports safe handling, storage and dispensing at the bench. Available from manufacturer Carl ROTH in extra pure quality, this solution is widely used for pH adjustment, precipitation and complexation steps, buffer and cleaning baths, and general inorganic or analytical procedures that require a defined ammonia concentration. Consistent assay and documented physical data help laboratories maintain reproducible conditions in research, teaching and quality-control environments. The compact litre pack suits both single-user stations and shared reagent stores where reliable aqueous ammonia is needed without unnecessary bulk. This article is part of Bases & alkalis, in Acids & bases. Key features Assay (NH3): 24.0-26.0 % Density (20 °C): 0,904-0,910 Chloride (Cl): ≤0,0001 % Iron (Fe): ≤0,0005 % Evaporation residue: ≤0,0005 % CAS number: 1336-21-6 Pack sizes: 1 l, 5 l, 10 l, 30 l EG nr.: 215-647-6 Purity: min. 25 %, extra pure Molar mass: 17,03 + aq g/mol Density: 0,907 g/cm³ Technical Information Sheet: Safety Data Sheet:
