thorina

[THORINUM.] Chem.: Tho. Thorinum oxide; thorinic oxide. Prepared from thorite by reducing it to a fine powder and decomposing with hydrochloric acid. After separation of various metallic oxides, it is treated with pota ic sulphate and precipitated as pota io-thorinic sulphate. From the solution of the salt in hot water, ammonia throws down thorinic hydrate, which on ignition yields thorina. It is a white powder of a specific gravity=9.402. The ignited oxide is insoluble in hydrochloric and nitric acids, and only difficultly soluble in sulphuric acid.