| Thorium Oxybromide, ThOBr2, is formed when an aqueous solution of the tetrabromide is evaporated to dryness and the residue is heated to 160° C. (Moissan and Martinsen); it is also obtained as a white, amorphous, friable mass by the method of Bourion (see above), and dissolves completely in water with slight hissing. From a solution of thorium hydroxide in alcoholic hydrogen bromide the crystalline hydroxybromides Th(OH)2Br2.4H2O and Th(OH)Br3.10H2O have been obtained. |