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ammonium carbonate a white powder that is used in baking powder, smelling salts, and substances for fire-extinguishing.
ammonium chloride a white crystalline salt used in dry cells, in medicine as an expectorant, and in various industrial applications; sal ammoniac.
ammonium hydroxide a colorless basic solution produced by dissolving ammonia in water, used as a household cleaner and in the production of textiles, plastic, and the like. (See ammonia.)
ammonium sulfate a water-soluble salt, used mainly to purify water and as a fertilizer.