Let’s know about Ammonium Bisulfate. Ammonium bisulfate , also known as ammonium hydrogen sulfate , is a white, crystalline solid with the formula (NH4 ) HSO4 . This salt is a product of the half-neutralization of sulfuric acid by ammonia .
chemical formula =(NH 4 ) HSO 4
molar mass =115.11 g/mol g
appearance =white solid
density =1.78 g / cm3
Melting point =147 °C (297 °F; 420 K)
Solubility in water =very soluble
Solubility in other solvents =soluble in methanol insoluble in acetone
It is commonly collected as a byproduct of the “acetone cyanohydrin root” for the commodity chemical methyl methacrylate. 
It can also be obtained by hydrolysis of sulfamic acid in aqueous solution , which produces the salt in high purity:
H 3 NSO 3 + H 2 O → [NH 4 ] + [HSO 4 ] –
It is also produced by the thermal decomposition of ammonium sulphate:
(NH 4 ) 2 SO 4 → (NH 4 ) HSO 4 + NH 3
It can be further neutralized with ammonia to make ammonium sulfate, a valuable fertilizer. It can be used as a weak substitute for sulfuric acid, although sodium bisulfate is much more common.
A related compound, of the formula (NH 4 ) 3 H (SO 4 ) 2 , occurs as the rare mineral letovisite, which is known from the atmosphere of coal fires.