OF SODA. 



11. Chromate of soda. This is a beautiful Chromate 

 transparent yellow salt, one of the finest of the 

 chromates. Its crystals are four-sided transpa- 

 rent prisms, with square bases sometimes octa- 

 hedrons, usually elongated. It does not seem 

 to undergo any alteration by exposure to the air, 

 but melts when exposed to a very moderate heat. 

 Its constituents are as follows : 



1 atom chromic acid 6 4 5 



1 atom soda . . 4> 



12 atoms water 13-5 



24- 



12. The bichromate is a very dark red saltBichro 

 with a shade of brown ; it crystallizes in large ir- 

 regular plates, seemingly rhombic. I have not 



yet succeeded in getting, it quite free from chro- 

 mate, for the solubility of both salts is nearly the 

 same. 



13. Tungstate of soda. I have obtained this T 

 salt both in six-sided prisms, apparently regular, 

 and in four-sided oblique prisms. Its taste is 

 intensely bitter. Its constituents are as fol- 

 lows : 



was not aware at the time, that neither the quantity of arsenic acid nor 

 phosphoric acid can be accurately determined by precipitation. The me- 

 thod of determining these salts, which I have given in the text, was by 

 synthesis a method susceptible of the most perfect accuracy, if the re- 

 quisite care be taken to employ the constituents in a state of purify. 



S2 



