Ammonium chloride is an inorganic compound with the formula and a white crystalline salt that is highly soluble in water,Solutions of ammonium chloride are mildly acidic.In its naturally occurring mineralogic form,it is known as salt ammoniac. 4 The minerals is commonly formed on burning coal dumps from condensation of coal-derived gases.It is also found around some types of volcanic vents.It is mainly used as fertilizer and a flavoring agent in some types of liquor ice.It is the product from the reaction of hydrovhloric and ammonia.