Ammonium bisulfate

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Chemically named NH₄HSO₄, ammonium bisulfate is a white, crystalline solid when it is completely pure. It is commonly collected as a byproduct of flue gas desulfization, formed by partial neutralization of sulfuric acid aerosol H₂SO₄ by gaseous ammonia, NH₃. Indeed, the solid material can collect on and foul solid surfaces in the flues. It is too acidic for most end uses, and is corrosive to the skin. It can be further neuralized with ammonia to form ammonium sulfate, a valuable fertilizer.