ACETIC ACID. 85 



acid, allowing to cool, filtering the benzoic acid off, 

 and evaporating the filtrate. Grlycocol hydrochlorate 

 remains behind. To an aqueous solution of this, lead or 

 silver oxide is added, the lead or silver chloride filtered 

 off, and, after the removal of any lead which may 

 remain dissolved, by means of sulphuretted hydrogen, 

 the solution is evaporated to crystallization. 



Large c^stals, stable in the air, soluble in 4 parts of 

 water, but little in alcohol. Fuses at 170 ; not volatile 

 without decomposition. The watery solution possesses 

 an acid reaction. It combines with bases, acids, and 

 salts. 



The copper salt (C 2 H 4 K0 2 ) 2 Cu + IPO, prepared by 

 dissolving copper oxide in a hot solution of glycocol, 

 separates on cooling in needles of a deep-blue color. 

 The silver salt C 2 H 4 ]N r 2 .Ag is obtained by allowing a 

 solution of glycocol, which is saturated with silver 

 oxide, to evaporate slowly over sulphuric acid. 



Ethyl ether of glycocol, CH 2 (OTI 2 ).CO.O.C 2 H 5 . 

 The hydriodate of this ether is obtained by heating an 

 alcoholic solution of glycocol with ethyl iodide at 115- 

 120. Clear, rhombic crystals, soluble in water, alcohol, 

 and ether. Silver oxide removes the hydriodic acid 

 from this compound, but the free ether decomposes, 

 when its solution is evaporated, yielding glycocol and 

 alcohol. 



Glycocol combines with hydrochloric acid, forming 

 two crystallizing salts, C 2 H 5 N0 2 .HC1 and 2(C 2 H 5 N0 2 ). 

 HCL Glycocol ^nitrate CWNO.IINO 3 crystallizes in 

 prisms. 



In addition to these there are a number of crystal 

 lizing compounds with chlorides, sulphates, and nitrates 

 known. 



Heated with dry caustic baryta, glycocol yields car 

 bonic anhydride and methylamine. When its aqueous 

 solution is treated with nitrous acid, glycolic acid is 

 produced. 



Methylglycocol (Sarcosine), C 3 H 7 N0 2 = CH 2 

 (NH.CH 3 ).CO.OH. Is produced by the action of methyl- 

 8 



