Sodium azidodithiocarbonate, solution

Sodium amide, 1 74, 2 80, 128, 134 Sodium amidophosphate (Na2P03NH2), 6 100 anhydrous, for preparation of tetrasodium imidodiphos-phate, 6 101 Sodium azide, 2 139 purification of, 1 79 Sodium azidodithiocarbonate, solution of, 1 82 Sodium butoxide, 1 88 Sodium carbonate, Na2C03, light, for preparation of chlorine (I) oxide, 5 159... 

Recrystallized sodium azide (12 g.) is dissolved in 50 ml. of water, and 12 ml. of carbon disulfide is added. The mixture is placed in a small flask fitted with a reflux condenser and kept at a temperature of about 40°C. for approximately 48 hours. If carbon disulfide is lost by volatilization, more is added from time to time. The resulting solution of sodium azidodithiocarbonate is filtered, chilled in an ice bath, and treated with chilled concentrated hydrochloric acid. The white, crystalline precipitate is washed twice by decantation with ice water, separated by filtration on a Buchner funnel, dried on a porous plate or between filter paper, preserved in a desiccator protected from the light, and kept at a temperature below 10°C. (In this way, azidodithiocarbonic acid may be kept for 24 to 48 hours without appreciable decomposition.)... 

Approximately 5 ml. of the filtered solution of sodium azidodithiocarbonate obtained as described in the preceding paragraph is diluted to 200 to 300 ml. with water. A normal solution of iodine dissolved in potassium iodide is added drop by drop, with continual stirring, until complete precipitation of azidocarbondisulfide has been effected. The slightest excess of iodine must be avoided, however, as iodine is adsorbed by the azidocarbondisulfide and can be... 

Silicon, higher chlorides of, 42 Silicon tetrabromide, 38, 40 Silicon tetrachloride, 44 Silicopropane, octachloro, 44 Silicotungstic acid, 129 analysis, 131 ether complex, 131 Silver, metallic, 4 Silver chloride, reduction of, 3 Silver cyanamide, 98 Silver residues, purification of, 2 Sodium amalgam, 10 Sodium amide, 74 Sodium azide, purification of, 79 Sodium azidodithiocarbonate, 82 Sodium butoxide, 88 Sodium hypochlorite (solution), 90 Sodium iodate, 168 Sodium metaperiodate, 170 Sodium paraperiodate, chlorine method, 169 persulfate method, 170 Strontium amalgam, 11 Sulfur hexafluoride, 121 Sulfuryl chloride, 114... 

The alkali azidodithiocarbonates may be obtained by the action of carbon disulphide vapour on an aqueous solution of the alkali azide at 40° C.2 With a 1 per cent, solution of sodium azide the action proceeds quantitatively ... 

---