CONTENTS. 



30. Arsenic. 



General remarks regarding the metals of the arsenic group 

 Arsenic Arsenous and arsenic oxides and acids Sodium 

 arsenate Hydrogen arsenide Sulphides of arsenic Arsenous 

 iodide Analytical reactions Preparatory treatment of or- 

 ganic matter for arsenic analysis Antidotes .... 



31. Antimony. Tin. Gold. Platinum. Molybdenum. 



Antimony Trisulphide, oxysulphide, and pentasulphide of 

 antimony Antimonous chloride and oxide Antidotes Anti- 

 mony reactions Tin Stannous and stannic chloride Tin 

 reactions Gold Platinum Molybdenum Summary of 

 analytical characters of metals of the arsenic group 



IX 



PAGE 



205-214 



215-221 



Y. 



ANALYTICAL CHEMISTRY. 



32. Introductory remarks and preliminary examination. 



General remarks Apparatus needed for qualitative analysis 

 Reagents needed General mode of proceeding in qualitative 

 analysis Use of reagents Preliminary examination Phys- 

 ical properties Action on litmus Heating on platinum foil 

 Heating on charcoal alone and mixed with sodium car- 

 bonate Flame-tests Colored borax-beads Liquefaction of 

 solid substances Table I. : Preliminary examination 



222-232 



33. Separation of metals in different groups. 



General remarks Group reagents Acidifying the solution 

 Addition of hydrogen sulphide Separation of the metals of 

 the arsenic group from those of the lead group Addition of 

 ammonium sulphide and ammonium carbonate Table II. : 

 Separation of metals in different groups 233-238 



34. Separation of the metals of each group. 



Table III. : Treatment of the precipitate formed by hydro- 

 chloric acid Treatment of the precipitate formed by hydrogen 

 sulphide Table IV. : Treatment of that portion of the hydro- 

 gen sulphide precipitate which is insoluble in ammonium 

 sulphide Table V. : Treatment of that portion of hydrogen 

 sulphide precipitate which is soluble in ammonium sulphide 

 Table VI. : Treatment of the precipitate formed by ammo- 

 nium hydroxide and sulphide Table VII. : Treatment of the 

 precipitate formed by ammonium carbonate Table VIII. : 

 Detection of the alkalies and of magnesium .... 238-241 



35. Detection of acids. 



General remarks Detection of acids by means of the action 

 of strong sulphuric acid Table IX. : Preliminary examina- 

 tion for acids Detection of acids by means of reagents added 



