ammonium sulfate, chemical compound, (NH 4) 2SO 4, a colorless-to-gray, rhombohedral crystalline substance that occurs in nature as the mineral mascagnite. It is soluble in water and insoluble in alcohol or liquid ammonia. It is prepared commercially by passing ammonia , obtained from destructive distillation of coal, into sulfuric acid and is used as a fertilizer , in preparing other ammonium compounds, and for fireproofing.
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