290 SALTS 



deposited on the sides of the vessel. These 

 crystals proved, on examination, to be arseniate 

 of strontian. They were very minute rectangu- 

 lar four-sided prisms, having no taste, and pro- 

 ducing no change on vegetable blues. The 

 salt dissolves very sparingly in water 100 grains 

 of that liquid, at the temperature of 60, dissolv- 

 ing only 0'284 grain of the crystals. When 

 23 f &5 grains of these crystals were exposed to 

 a heat gradually raised to redness, the loss of 

 weight, owing to the escape of moisture, was 9 

 grains. Hence, the constituents of the salt are 



1 atom arsenic acid 7*75 



1 atom strontian . 6-5 

 8 atoms water . 90 



23-25 



Chromate, 7. Chromate of strontian. This salt is easily 

 formed by mixing together solutions of chromate 

 of potash and nitrate of strontian the chromate 

 of strontian immediately falls down. When edul- 

 corated and dried in the open air, it is a powder, 

 having a fine yellow colour, destitute of taste, 

 and not sensibly soluble in water. It loses no 

 weight by exposure to a red heat, and is, there- 

 fore, anhydrous. Its constituents are 



1 atom chromic acid 6*5 



1 atom strontian 6'5 



13 



\ 



