130 UNIVERSITY OF COLORADO STUDIES 



CARBON AND HYDROGEN DETERMINATION 



0.1420 g. of substance gave 0.3970 g. C0 2 and 0.1052 g. H 2 0. 



C I2 H l6 N 2 



Computed Found 



= 76.59 per cent. 0=76.24 per cent. 



H= 8.51 per cent. H= 8.23 per cent. 



NITROGEN DETERMINATION 



0.5152 g. substance gave 84.4 c.c. N at a temperature of 22. 5 and a 

 pressure of 610.4 mm. 



Computed Found 



N= 14.87 per cent. 15-18 per cent. 



MOLECULAR WEIGHT DETERMINATION 



0.2426 g. substance, dissolved in 17.21 g. benzene, lowered the freezing- 

 point 0.36 . 



Computed Found 



C I2 H l6 N 2 = i88. 192. 



HYDROBROMIC ACID SALTS 

 A 



Hydrobromic acid gas was passed through a benzene solution of the 

 base. A canary-yellow crystalline powder was immediately precipitated. 



ACID DETERMINATION 



0.2041 g. salt required 6.05 c.c. of a 0.12626N. NaOH solution. 



C I2 H l6 N 2 -HBr 



Computed Found 



HBr=3o.io per cent. 3°-33 P er cent - 



B 

 A solution of the base in aqueous hydrobromic acid was allowed to 

 evaporate in a vacuum desiccator over calcium chloride. After several 

 days the salt crystallized in long colorless needles. 



ACID DETERMINATION 



0.2442 g. of salt required 11.2 c.c. of a .12626N. NaOH solution. 



C I2 H l6 N 2 - 2 HBr 



Computed Found 



2 HBr=46.28 per cent. 46.34 per cent. 



