SULPHURIC ACID ON DIALLYL. 9 



for about five hours with the following oxidizing solution 

 in a flask, in connexion with an upward condenser : — 



20 grams potassium bichromate. 

 30 „ sulphuric acid. 

 120 cub. cent, water. 



In this case less carbonic acid was evolved than in the 

 former one. The contents of the flask were distilled from 

 a retort, the distillate being neutralized with sodium car- 

 bonate. The neutral solution was distilled with an excess 

 of sulphuric acid. The distillate, containing in a free state 

 the acids of oxidation, was slowly distilled four times from 

 a retort, the residues being preserved in each case, and the 

 final distillate rendered just neutral by sodium carbonate. 

 About two thirds were slowly distilled off the collected 

 residue, the final residue from which was neutralized by 

 silver oxide filtered, and the silver salt analyzed. It is 

 evident, if the two acids, acetic and butyric, had been formed, 

 that almost the whole of the acetic would be in the final 

 residue, and the butyric in the final distillate. The ana- 

 lyses below show that the salt obtained from the final re- 

 sidue consisted of pure silver acetate : — 



(a) 0*1447 salts gave 0*094 silver. 



(b) 0*3362 salts (from mother liquor) gave 0*2183 silver. 



Found Calculated for 



(a) (b) C 2 H 3 2 Ag. 



64*96 64*93 per cent, silver. 64*67 per cent, silver. 



The two thirds which were distilled off from the collected 

 residues were added to the neutral sodium salt of the final 

 distillate, and the whole distilled from a retort ; the re- 

 sulting distillate, however, did not furnish sufficient acid 

 for analysis. Five drops of sulphuric acid, together with 

 water, were added to the contents of the retort, and distil- 

 lation was recommenced. From the distillate a silver salt 

 was obtained, which the following analyses show to be also 

 silver acetate : — 



