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:

NH4SCNSC(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 articles

Zn in 8WB0
Zn in 8WAX
Zn in 8WAU
Zn in 8WAZ
Zn in 8WAY
Zn in 8WAV
Zn in 8WAW
Zn in 8WAT
Zn in 8W7M
Zn in 8WD3
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy