|
Atomistry » Carbon » Chemical Properties » Thiourea | ||
Atomistry » Carbon » Chemical Properties » Thiourea » |
Thiourea, CS(NH2)2
Thiocarbamide, Thiourea, CS(NH2)2. - Thiourea is formed by heating ammonium thiocyanate to 140° C., this salt undergoing an isomeric change analogous to that produced in ammonium cyanate by heat:
NH4SCN ⇔ SC(NH2)2. At the same time some guanidine thiocyanate, NH:C(NH2)2.HSCN, is produced, though a larger proportion of this latter substance is formed at 170°-180° C. The thiourea is freed from guanidine thiocyanate and unchanged ammonium thiocyanate by cold water, in which the thiourea is but sparingly soluble; it is then purified by recrystallisation from water. A better method of preparation consists in heating carbon disulphide (6 grams) with ammonium carbonate (8 grams) in a sealed tube at 160° C., when the yield is quantitative. Thiourea crystallises in rhombic prisms, and dissolves in eleven times its weight of cold water. When heated with water to 140° C. it reverts to ammonium thiocyanate. It forms salts analogous to those of urea; the most characteristic of these is the nitrate, CS(NH2)2.HNO3. |
Last articlesKr in 3GKTKr in 1C6Q Kr in 1C6G Kr in 1C6A Kr in 1C67 Kr in 1C61 Kr in 1C64 K in 7L4G K in 7KLP K in 7KAZ |
© Copyright 2008-2020 by atomistry.com | ||
Home | Site Map | Copyright | Contact us | Privacy |