MURIATES AND CHLORIDES. 



the heat in a close vessel, the whole water is 

 driven off, and a smalt blue coloured chloride of 

 cobalt remains in a hard mass, which readily dis- Chloride, 

 solves in water, forming a red coloured solution. 

 When the solution of muriate of cobalt is dilute, 

 it has a red colour ; but when veiy much con- 

 centrated by evaporation, the colour becomes 

 blue or green, if iron or nickel be present in 

 the liquid. This change of colour takes place 

 more readily if an excess of acid be present in 

 the liquid. The crystallized muriate of cobalt 

 is composed of 



1 atom muriatic acid . 4-625 

 1 atom protoxide of cobalt 4-250 

 4 atoms water - . 4*500 



13-375 



When 1 3*375 grains of these crystals are heated, 

 they give out 5*625 grains of water, equivalent 

 to 5 atoms ; and there remain 7*75 grains of 

 blue coloured chloride of cobalt. 



14. Muriate of zinc. Muriatic acid dissolves Muriate of 

 zinc with facility ; but the solution cannot be 

 made to crystallize. When kept for some time 

 on the sand bath till it ceased to lose weight, it 

 concreted, on cooling, into a white opaque mat- 

 ter, having a very strong and disagreeable taste, 

 and speedily deliquescing, when exposed to the 

 air. It was analyzed by dissolving a given 



VOL. II. P 



