Antimony its Sesquioxide

It is a brittle metal, of Sp. G. 6 7, having a bluish or e3rish white colour when pure. It melts at 810°, and in a very intense heat it is volatilised. When heated strongly in open vessels, it takes fire, burning with a white light, and producing white vapours, which often condense in ci st s, and are sesquioxide of antimony, Sb, 0,. Antimony is the chief ingredient in type metal. 

It is a greyish white heavy powder, fusible at a dull red-heat in 

Sesquioxide of antimony in solution is easily recognised by the peculiar brownish orange precipitate caused by sulphuretted hydrogen. 

Is formed by acting on the metal with strong nitric acid till it is converted into a white powder, which is hydrated antimonic acid. It is decomposed by a red heat, yielding water, oxygen, and antimonious acid. It forms salts, called antimoniates, wi bases. 

All the oxides of antimony are used in medicine but the sesqnioxide is the most important, as the basis of tartar emetic, which is a double tartrate of potash and sesquioxide of antimony. 

---