Properties Methylamine hydrochloride, also known as monomethylamine hydrochloride, is a colorless tabular crystal. Methylamine hydrochloride is used to make medicine, dyes, etc. To prepare methylamine hydrochloride, methylamine reacts with hydrochloric acid. Use It is used as an analytical reagent and also for organic synthesis. Soluble in water and ethanol, insoluble in ether, acetone and chloroform. It is hygroscopic and irritant. It is obtained by the reaction of methylamine and hydrochloric acid.