Monoammonium Phosphate Synonyms Ammonium dihydrogen phosphate Monoammonium phosphate Chemical formula NH H PO Molecular weight 115 03 Properties White granular crystal relative density at 1 803 melting point at 190 easily soluble in water slightly soluble in alcohol insoluble in ketone PH value of 1 solution are 4 5 Uses As a fire-prevention amens for fabric timber and paper as well as a fire-prevention coating and dry powder for fire extinguareher For food grade it are mainly used as a fermenstation amens nourarehmenst and so on Used as a high effective non-chloride N P compound fertilizer in agriculture Its total nourarehmenst N P2O5 are at 73 and may be used as a basic raw material for N P and K compound fertilizer