SPECIFIC GRAVITY TABLES. 



81 



XXI. Selenites and Selenates. 



Name. 



^ Mercury sub-selenite. 

 ^ Barium selenate. 

 ^ Lead « 



* Yttrium « 

 ^ Selenic alum. 



Formula. 



3 Hgv, 0. 4 We O,. 



Ba Se O,. 



Pb Se O,. 



Y Se O,. 3 H., O. 



AlK(SeO,),.12H,0. 



Specific Gravity. 



7-35- 



4.67, 22.° 

 6.37, 22.° 

 2.6770. 

 1.971. 



Boiling Melting 

 Point. Point. 



XXII. Chromates. 



