ammonium sulfate

The Columbia Encyclopedia, 6th ed. | 2011 | 437 words | Copyright

ammonium sulfate chemical compound, (NH ₄ ) ₂ SO 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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