78 P. C. Hay — (JLenucal Kicainlnation of [No. 1, 



The mean of the three numbers is 123*5 

 But Jc. c. NagSgOg =1 c. c. -JqIx y^Tg 

 Hence the iodine degree (corrected) = 120 



Iodine Degree for Earth-nut Oil.* 

 (1) 0*181 gm. oil was digested with 20 c. c. iod. sol. and 10 c. c. 

 CHCI3. 



20c. c. I + lOc. c. CHCl3 = 20*8c. c. NagSgOg (Blank titration) 

 4" 7 c. c. NajSgOg were required for the excess of iodine. 



T J. J 16*1x0*01265x100 „^ . 



iodine degree ~ aTTot = 112o 



O'JoJ. 



But Ic. c. NaoSoO, = Ic. C. -tt I X rr-r 



JO il"o 



Corrected number = 1120 x ——=97 5 



J JL'O 



( 2) 0*1645 gm. oil was treated with 30c. c. iod. sol. and 10c. c. chloroform. 



(3) 0*1535 „ „ „ 30 ,, ,, „ „ 



(2) Required 15'0c. c. NagSgOg for the excess of iodine. 



(3) „ 16-0 „ 



The iodine degree for (1) =1038 



(2) =103-0 

 Mean of two determinations =103*4 



But Ic.c. NagSjOg =1^*^- Ta I>< Ta^ 

 Hence coi'rected number =103'4 x tttt == 98*5 



10*0 



MowA Fat. 



(1) 0*1815 gm. oil was treated with lOc.c. CHCI3 and 20c.c. iod. sol. 



(2) 0*186 „ „ „ and 30c.c. „ „ 



11*5 c. c. NaaSgOg were reqd. for the excess of iod. by (1) 

 21'5 „ ,, ,, „ ,, ,, (2) 



20*0c. c. iod. sol. + 10c. c. CHClg^ 20-6c. c. NajSjOg 

 30'0 ,, ,, ,, „ =:30'9,, ,, 



From which we get the iodine degree for 

 (1) as 63-42, and that for (2) as 63*88 

 Mean of two =63-7 



But Ic. c. NaaSa03 = lc.c. fo^x-jQTo 

 Corrected number = 63-7 x 77-5= 61*8 

 * The saponification equivalent of this sample was found to be 195-0. 



