Identification of Organic Compounds. 35 



introduced into the conical (Erlenmeyer) flasks. Generally 

 50 c.c. of tenth-normal sulphuric acid should be used, and 

 the excess not neutralized by ammonia is estimated after 

 the completion of the distillation by titration with tenth- 



Fig. 14. 



normal sodium hydroxide with the use of sodium alizarine 

 sulphate or dialyzed litmus or any other convenient 

 indicator. Each c.c. of decinormal acid neutralized by the 

 ammonia is equivalent to 1*4 mg. of nitrogen. 



ESTIMATION OF OTHER ELEMENTS IN ORGANIC COMPOUNDS. 



There are various methods of estimating chlorine, 

 bromine, iodine, phosphorus, and sulphur in organic com- 



