364 SALTS 



(^ Chromate of cadmium. This salt was ob- 

 tained by mixing together solutions of sulphate 

 of cadmium and chromate of potash. The chro- 

 mate falls in the state of a most beautiful yellow 

 coloured powder ; it has little or no taste, yet 

 it is not absolutely insoluble in water : for when 

 washed on the filter, the liquid always passes 

 through of a yellow colour. And in one of my 

 experiments, I dissolved almost the whole of a 

 quantity of chromate of cadmium by persisting 

 in trying to wash it till the liquid should pass 

 through colourless. 20-525 grains of this salt, 

 when exposed to a red heat, assumed a darker 

 yellow colour, and lost 6 grains of its weight : 

 hence, its constituents are 



1 atom chromic acid 6*5 



1 atom oxide of cadmium 8 



5 atoms water 5-625 



20-125 



The small surplus water was doubtless hygrome- 

 trical. 



Acetate, j t Acetate of cadmium. When a very con- 

 centrated solution of this salt is exposed for 

 about ten days to the air, it is gradually con- 

 verted into a crystalline mass, while a thick li- 

 quid remains floating above it. These crystals 

 are very soluble in water, and undergo little 

 change from exposure to the air. 22' 13 grains 

 of these crystals, previously dried upon blotting 



