CONTENTS. 



IX 



Simultaneous precipitation and solution, . , 131 



Lead and silver trees, ..... 132 



Precipitation of metals by fluid reagents : gold, . 133 



Faraday's ruby gold ..... 134 



Charcoal from sugar, . . . . . 134 



CHAPTER XL Solution of Gases in Liquids and Separation 



of Gases from Liquids, .... 135-155 



Neutral solids produced by combination of ammonia 



gas with acids, . , . . r . 135 



Alkalies and antacids, . ~~ *. V ". ' , 135 



Restoration of colour of spotted clothing, .. "' . 136 



Removal of inkstains and iron-mould, . '.; . * 137 



Test papers for acids and alkalies, < ., . ..- . . '. 188 

 Mild and caustic alkalies : causticising, . ; 139 

 Solubility of sulphuretted hydrogen in ammonia solu- 

 tion, ....... 141 



Production of sulphuretted hydrogen : precautions, . 141 



Stink closet, or futne chamber, . . ; . :*.. 142 



Action of sulphuretted hydrogen on paint, . . . 142 



Separation of gases by solvent chemical action, . 143 



Production of colour during chemical solution of gases, 144 



Air a mixture of oxygen and nitrogen, . . . 144 

 Fresh supply of air necessary to keep flame alight : 



ventilation : brattice, . . 145 



Indigo dyeing, . . . . . . 146 



Precipitation by absorption of gas : limewater and carbon 



dioxide, . . . . . . 146 



Carbon dioxide contained in the breath, and formed 



when a candle is burnt, . . . 147 



Hard and soft water, . . ... . 149 



To soften hard water, . . . . . 150 



Separation of metals by sulphuretted hydrogen gas, . 151 

 Evolution of gases from liquids by chemical action : 



ammonia : sulphur dioxide : chlorine, . . 152 

 Bleaching power and other properties of chlorine solu- 

 tion, . . . . . 'v. .... 153. 



CHAPTER XII. Intermixture of Liquids accompanied by 



Chemical Action, ; . . .. . . 155-160 



Neutralisation of sulphuric acid,. . .. . . 155 



Solution of quicksilver, bromine, &c., . . . 156 



