OF COBALT. 34fO 



6. Arseniate of cobalt. This salt is easily 

 obtained by mixing together solutions of nitrate 

 of cobalt and arseniate of soda, and evaporating 

 the solution. The arseniate falls in the state of 

 a crimson coloured jelly, which, when washed 

 and dried, assumes the form of scales. It is 

 light, and has a fine crimson colour ; is tasteless, 

 and does not alter the colour of vegetable blues. 

 When 16*5 grains of this salt were exposed to a 

 red heat, the loss of weight was 5 grains ; hence, 

 I am disposed to consider it as a compound of 



1 atom arsenic acid 7' 75 



1 atom protoxide of cobalt 4-25 

 4 atoms water 4*5 



16-5 



The loss of weight would indicate very nearly 

 4 atoms water ; but the half atom was probably 

 only mechanically lodged between the particles 

 of the salt. 



7. Binantimoniate of cobalt. This is a red Bi 



mate, 



coloured salt not quite insoluble in water, which 

 was analyzed by Berzelius ; and from his expe- 

 riments it appears that it is a compound of 



2 atoms antimonic acid 15 

 1 atom protoxide of cobalt 4-25 

 8 atoms water 9 



28-25 



The water found by Berzelius amounted to one 



