THE DETERMINATION OF REFRACTIVE INDEX 

 TABLE IV. 



203 



COMPOUNDS BELONGING TO THE ISOMETRIC SYSTEM WHOSE 

 CRYSTALS MAY BE USED FOR THE DETERMINATION 

 OF THE REFRACTIVE INDICES OF LIQUIDS. 



Refractive 

 index. 1 



Name. 



Formula. 



439 

 450 

 459 

 481 



485 

 .490 



494 

 515 



544 

 553 

 559 

 .566 

 571 

 .640 



645 

 .650 



.657 

 .667 



.698 



.700 



755 



1.788 



I-95+ 

 2.071 



Sodium alum 



Potassium alum 



Ammonium alum 



Potassium chromium alum . 



Ammonium iron alum 



Potassium chloride 



Rubidium chloride 



Sodium chlorate 



Sodium chloride 



Rubidium bromide 



Potassium bromide 



Strontium nitrate 



Barium nitrate , 



Ammonium chloride 



Cesium chloride 



Rubidium iodide 



Potassium chlorostannate . 

 Potassium iodide 



Cesium bromide 



Ammonium iodide 



Arsenic trioxide 



Cesium iodide . . 



Lead nitrate. . . 

 Silver chloride 



Na 2 SO 4 Ala (SO 4 ) 3 24 H 2 O 



K 2 SO 4 Al, (SO 4 ) 3 24 H 2 O 



(NH 4 ) 2 SO 4 A1 2 (SO 4 ) 3 24 H 2 O 



K 2 SO 4 - Cr 2 (SO 4 ) 3 24 H 2 O 



(NH 4 ) 2 S0 4 Fe 2 (S0 4 ) 3 24 H 2 O 



KC1 



RbCl 



NaClO 3 



NaCl 



RbBr 



KBr 



Sr (N0 3 ) 2 



Ba (N0 3 ) 2 



NH 4 C1 



CsCl 



Rbl 



K 2 SnCl 6 



KI 



( n lies between 

 \ 1.69 and 1.71 



NHJ 



As 2 3 



^ T ( Bolland gives 



Csl .......... 



CsBr.. 



Pb (NO 3 ) 2 . . . . 

 AgCl 



Groth gives i . 782 



1 Most of these values for n are taken from Groth's tables. 

 Leipzig, 1906-10. 



Chemische Krystallographie, 



