236 Intelliffence and Miscellaneous Articles, 



"to 



phatc of barytes, gave, by evaporation over sulphuric acid, regular 

 octahedrons. The crystals are extremely deliquescent, and very so- 

 luble in alcohol; they melt at 122°, and are totally decomposed at 

 212°, with the evolution of chlorine, oxygen and water, leaving pure 

 peroxide of cobalt. 



This salt yielded by analysis. 



Chloric acid .... 45*18 

 Oxide of cobalt . . 22'48 

 Water 32-34 



100- 



Chlorate of Copper. — The solution of this saltj obtained by the 

 decomposition of chlorate of barytes and sulphate of copper, yielded 

 by evaporation in vacuo over sulphuric acid, a dark green liquid of 

 the consistence of a syrup, which became a crystalUne mass by ex- 

 posure to intense cold. Distinct crystals, which appeared to be 

 regular octahedrons, were however rarely obtained. Chlorate of 

 copper is very deliquescent and very soluble in alcohol ; it fuses at 

 149°, and begins to decompose at a somewhat higher temperature ; 

 fused chlorate of copper does not solidify till the temperature is re- 

 duced to about 68°, even when it has not suffered the sUghtest de- 

 composition by heat; if it be heated to 212°, bubbles of gas are dis- 

 engaged, each of which occasions a slight detonation. "When the 

 decomposition is effected at the lowest possible temperature, a green 

 residue is obtained, which suffers no further decomposition till heated 

 to above 500° ; this is insoluble in water, but very soluble in dilute 

 acids ; the solution in weak nitric acid gives no precipitate with ni- 

 trate of silver ; the solution in hydrochloric acid has a very distinct 

 smell of chlorine ; this green substance is therefore a basic chlorate 

 of hydrate of copper. 



Chlorate of copper yielded by analysis. 



Chloric acid 44-60 



Oxide of copper. . 23-45 

 Water 31-95 



JOO- 

 Chlorate of Lead. — A neutral solution of this salt is obtained by 

 saturating chloric acid with the oxide ; its concentration may be 

 continued over the spirit-lamp, without decomposition, until it begins 

 to crystallize on cooling ; the crystals are rhombic prisms ; they are 

 at first transparent and possess much lustre, but by exposure to the 

 air they quickly become dull and opake ; they do not deliquesce, but 

 they dissolve very readily in water and in alcohol. When mixed 

 with combustible bodies, they detonate by percussion almost as 

 strongly as the potash salt. At 302° the crystals lose 4-59 per cent. 

 of water; at 446° they are suddenly decomposed with a hissing 

 noise, yielding chlorine and oxygen, and a partly fused black mass 

 remains, which is a mixture of peroxide and chloride of lead ; if the 

 heat be continued this yields oxygen, and is converted into basic- 

 yellow chloride of lead, the composition of which is constant. 



