557 



TABLES 593-597.— ROTATION OF PLANE OF POLARIZED LIGHT 



TABLE 593.— TARTARIC ACID, CAMPHOR, SANTONIN, SANTONIC ACID, 



CANE SUGAR 



A few examples are here given showing the effect of wavelength on the rotation of the plane of 

 polarization. The rotations are for a thickness of one decimeter of the solution. The following 

 symbols are used : 



p = number grams of the active substance in 100 g of the solution. 



c = " solvent " 



q = " " active " " cm 3 



Right-handed rotation is marked +, left-handed — . 



Santonin, CisHxgOg, 



dissolved in chloroform 



9= 75 to 96.5, 



temp = 20° C 



-140? 1 + .2085 q 



-149.3 + .1555 q 



—202.7 + .3086 q 



—285.6 + .5820(7 



—302.38+ .6557g 



—365.55+ .8284(7 

 —534.98 + 1.5240(7 



Santonic acid, 



, C16H20O4, 



dissolved in 



chloroform. 



c= 27.192 



temp = 20°C 



— 49° 



— 57 



— 74 

 -105 

 -112 



—137 



— 197 



-230 



Values obtained at the National Bureau of Standards for the rotation of sucrose are given below. 



Light 

 source 



Li 6708 

 Cd 6438 

 Na 5892.5 

 Hg 5780 

 Hg 5461 

 Ag 5209 

 Cd 5086 

 Cd 4800 



Rot X 



Rot X — 5461 A 

 .644 



.711 



.84922 



.8854 



1.0000 



1.108 



1.167 



1.323 



f>] 2 ° 



x 



50.45 

 55.70 

 66.529 

 69.36 

 78.342 

 86.80 

 91.43 

 103.65 



* Degrees per dm. The above values are for a near normal solution, i.e., approximately 26 g of sucrose per 

 100 cm 3 . 



SMITHSONIAN PHYSICAL TABLES 



