NITROGEN-BO.NDKU KADICALS: IDENTIFICATION 



with tetraphenylboron, the characteristic 

 isotropic crystalUzation of NH4CI, and the 

 characteristic crystals with HAiiBr4 in 

 H3PO1 . However, a test especially for am- 



% 



3:^ 



'••'is 



^•%:#^ 



4 







Fig. la. Ammonium chloride isotropic crystal- 

 lization (from water or dilute HCl). 66X. 



monia is desirable, as it is the commonest 

 product. 



Ammonia condenses very readily with form- 

 aldehyde to form methenamine (hexa- 



^,-:^ > X-, 



Fig. Ic. NH4CI with HAuBr4 in H3PO4 , (20) 

 crystals at periphery of precipitation, with a 

 slightly moist reagent. lOOX. 



Fig. 2a. Methylamine (from epinei)liriue in 

 Fig. lb. NH4CI deposit with HAuBr4 in volatility test with Na tetraphenylboron (1:20 in 

 H3PO4 , (20). 135X. water), in hanging drop. lOOX. 



49 



