326 PRACTICAL ORGANIC CHEMISTRY It is essential that students practise these tests until they can be reasonably certain of accurate results with unidentified compounds. The following scheme for the identification of organic compounds is based largely on an initial classification of the compounds according to the elements they contain: hence an error in the identification of these elements may lead a student completely astray throughout the subse-quent investigation. The Sodium Carbonate-Zinc Method for Detecting Nitro-gen, Halogens and Sulphur in Organic Compounds. This method, due to Middleton (Analyst, 1935, 60, 154), has the advantage over Lassaigne's method (pp. 321-326) that the use of metallic sodium is avoided: it has the disadvantage, however, that the reagents are not so readily obtained pure, and the method requires rather more time. The organic compound is heated with a mixture of sodium carbonate and zinc dust, when nitrogen and halogens are split off as sodium cyanide and
This is the end of the preview. Sign up
access the rest of the document.
This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.