220 



jSpeyers — Molecular Weights of some 





Solvent. 



Solute. 



p 



p' 



p—p' 



m 3 



m 4 



t° 



Benzamid 121. 

 From Kahlbaum 



29-65 

 27-15* 

 27-54* 

 25-57 



5-520 

 8-353 

 8-119 



7-805 



2-809 

 4-988 

 5-049 

 3-922 



2-645 

 4-373 



4-442 

 3-457 



0-164 

 0-615 

 0-607 

 0-465 



138 ±18 



101 ±4 



99 ±4 



104 ±10 



142 ±22 

 108 ±6 

 107 ±7 

 111 ±10 



27-0° 

 42-2 

 42-2 

 43-7 



Resorcinol 110. 



20-40 

 16-28 



20-30 

 20-74 



2-511 



2-448 



1-151 

 0-936 



1-360 

 1-512 



38-8 ±0-5 

 36-3±0-l 



58-7±0-5 

 61-0±0-l 



30-0° 

 30-0° 







Propyl alcohol. 











From Kalilbaum. Treated with CaO for 24 hours. Distilled off. Boiling point 96 '6 



uncor. Bar. 766-762. 



°-96-9° 



Acenaphthene 154- 



2736 



27-08 



2167 

 2-176 



3-642 

 1-756 



3-541 

 1-716 



o-ioi 



0-040 



167 ±52 

 207 ±84 



169 ±56 



209 ±84 



45-2° 

 45-3 



Naphthalene 128. 



28-70 

 26-52 



25-58 

 23-88 



3-035 



6-970 



6-848 

 6-943 



0-957 



2-124 

 3-150 

 2-413 



0-898 

 1-998 



2-853 

 2-200 



0-059 

 0-126 

 0-297 

 0-213 



97 ±17 

 250 ±34 

 154 ±9 

 180 ±16 



100 ±19 

 259 ±35 

 162 ±13 

 189 ±16 



29-8° 



45-5 



45-6 



a 









Toluene. 











From Kahlbaum. Treated with Na for 15 hours and distilled. Boiling point 



uncor. Bar. 770. 



110-3° 



Naphthalene 128. 



30-58 

 21-38 

 19-08 



16-47 

 21-51 

 22-34 



2225 



4-105 

 4-200 



1-595 

 2-358 

 2-260 



0-630 

 1-747 

 1-940 



126 ±1 

 125 ±2 

 125 ±3 



149 ±2 

 167 ±2 

 174 ±2 



29-5° 

 41-1 



45-1 



Acenaphthene 154- 



31 27* 



25-44 



25-45 



25-91* 



23-42* 



20-98* 



22-94 



6-60 

 9-093 

 9-148 

 9-293 

 10-27 

 14-36 

 14-60 



1-078 

 1-833 

 2-888 

 1-631 

 2-138 

 2-069 

 6-237 



0-951 

 1-495 

 2-388 

 1-970 

 1-720 

 1-428 

 4-452 



0-127 

 0-338 

 0-500 

 0-339 

 0-418 

 0-641 

 1-785 



145 ±5 



145 ±3 



158 ±3 



159 ±3 

 166 ±4 

 140 ±2 



146 ±4 



155 ±11 

 161 ±3 



174 ±3 



175 ±3 

 185 +6 

 170 ±4 

 174 +4 



20-8° 



27-5 



28-4 



28-5° 



31-3 



42-5 



45-1 



21-01 16-93 5-519 5-672 1-847 147 ±4 182 ±4 51-4 



Resorcinol in water 61 per cent to 67 per cent resorcinol. 

 Resorcinol is associated according to each formula and neither 

 one is to be preferred. 



Urea in methyl alcohol. 19 • per cent to 28 per cent urea. 

 At 28°, the molecular weight of urea is 61'8±2'3 by formula 

 (1) and 65-8 + 2-7 by formula (2). At 44°, the molecular weight 

 drops very much, but a solution of urea in methyl alcohol can- 

 not be evaporated at 44° without decomposition. Moreover, 

 after standing 24 hours another solution of the same strength 

 and kept at 44° had altered in density and smelled of ammonia 

 showing decomposition at that temperature. Formula (1) to be 

 preferred. 



Acetanilid in methyl alcohol. 33 per cent to 51 per cent 

 acetanilid. In all cases, the molecular weight is below the 

 normal. But acetanilid decomposes in solution into anilin and 



* With a somewhat different apparatus. 



