﻿70 BACON AND FREER. 



conducted, then these condensation products result, the greater the decom- 

 position, the greater their amount. 



obtained, containing 



2.65 grams pure, white sodium 



acetone 



were obi 



0.8052 gram sodium. 







Required 







for C 3 H 5 ONa 







Sodium. 





Found. 



Per cent. 





Per cent. 



28.75 





30.3 



The acid solution resulting from the decomposition of -the product of 

 the action of sodium on acetone was now rendered alkaline with ammonia, 

 and iodine, dissolved in ammonium iodide, added until the color of 

 iodine no longer disappeared. There resulted 6.5 grams of iodoform, 

 equal to 1 gram acetone or 53 per cent of the amount calculated for 

 pure sodium acetone. s Undoubtedly, some loss of iodoform occurs in 

 evaporating its etherial solution and all acetone is not converted into 

 iodoform, so that the percentage of acetone is probabby really higher 

 than given above. 



Experiment 2. — About 1.5 grams sodium wire were dissolved in an 

 excess of acetone diluted with absolute ether, the whole being in an 

 Ehrlenmeyer flask having a very small neck. The flask was not sur- 

 rounded by ice, the heat generated by the reaction evidently volatilizing 

 enough ether to exclude air, the sodium derivative remaining white. The 

 sodium compound was now rapidly filtered on a Hirsch funnel with 

 strong suction, quickly washed six times with ether and then dried in 

 a vacuum desiccator over sulphuric acid and paraffine. The salt was 

 somewhat pink, but as soon as it was dry it was weighed to a tenth of a 

 gram as quickly as possible and then thrown into ice-cold, dilute acid. 

 The acid was now saturated with potassium carbonate and the low-boiling 

 portion distilled on a water-bath. The distillate was saturated with a 

 solution of sodium bisulphite and the whole cooled in ice for one hour. 

 The acetone sodium-bisulphite (4.5 grams from 3.8 grams sodium com- 

 pound) was filtered and decomposed with sodium carbonate, the acetone 

 being distilled. There resulted 1 gram of acetone boiling at 54° to 57°. 



Experiment 3. — This was carried out exactly as was Experiment 2, 

 with the difference that a sodium determination was made by using an 



5 We have once more tested this method of determining acetone in the presence 

 of isopropyl or ethyl alcohol, and can substantiate the former statements of Freer 

 that it is sufficiently accurate for the work in hand, the results being under rather 

 than over the amount of acetone. Deniges very convenient method of acetone 

 determination is unsuitable as both isopropyl alcohol and mesityloxide give precipi- 

 tates with his reagent. Deniges, Gompt. rend. Acad. d. sc. Par. (1898), 127, 963; 

 Ann. Ghim. Phys. (1899), VII, 18, 400; Bull. d. la Soc. cUm. (1899), III, 21, 

 241. Oppenheimer; Ber. d. chem. Ges. (1899), 32, 986; Chem. Gentrbl. (1899), 

 II, 88S. 



