Neodymium hydroxide, Nd(OH)₃

Neodymium hydroxide, Nd(OH)₃, is obtained as a blue precipitate when an alkali hydroxide is added in excess to a solution of a neodymium salt. When dried at 300° it leaves the hydrate 2Nd₂O₃.3H₂O; this, when heated to 525°, is converted into the hydrate Nd₂O₃.H₂O; and the latter at a bright red heat is converted into neodymia.