Chemically named NH4HSO4, ammonium bisulfate, also "ammonium hydrogen sulfate", 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.
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