Ammonia Water (Ammonium Hydroxide) (chemical formula NH₃·H₂O, molecular weight 35.05, CAS:1336‑21‑6, UN:2672) is a colourless transparent liquid with strong pungent ammonia odour. It is a volatile weak inorganic base, miscible with water in any ratio. Widely used in water treatment, textile dyeing, fertilizer manufacturing and chemical synthesis industries.