VI CONTENTS 



VI. A Revision of the Atomic Weight o? Arsenic; The Analysis of Silver 

 Arsenate. By G. P. Baxter and F. B. Coffin. 



Introduction 73 



Preparation of Trisilver Arsenate 74 



Purification of Other Materials 76 



IMethods of Analysis 77 



Insoluble Residue 81 



Determination of Moisture in Dried Silver Arsenate 82 



Specific Gravity of Silver Arsenate 84 



Results and Discussion 85 



VII. A Revision of the Atomic Weight of Iodine; The Synthesis of Silver 

 Iodide and the Ratio of Silver Iodide to Silver Bromide and Silver 

 Chloride. By G. P. Baxter. 



Introduction 91 



Ratio of Silver to Silver Iodide 92 



Purification of Materials 92 



Method of Synthesis 94 



Specific Gravity of Silver Iodide 96 



Results 97 



Ratio of Silver to Iodine 99 



Results loi 



Ratio of Silver Iodide to Silver Chloride 102 



Results 104 



Ratio of Silver Iodide to Silver Bromide 105 



Results 106 



Ratio of Iodine to Silver and Silver Iodide 107 



Discussion of Results no 



Ratio of Silver Bromide to Silver Chloride in 



Historical Discussion 112 



Summary 114 



VIII. A Revision of the Atomic Weights of Iodine and Silver; The Analysis 

 OF Iodine Pentoxide. By G. P. Baxter and G. S. Tilley. 



Introduction 117 



Purification of Materials for the First Series of Analyses 118 



Conversion of Iodic Acid into Iodine Pentoxide 121 



Determination of Iodine in Iodine Pentoxide 1 23 



Determination of Moisture in Iodine Pentoxide 126 



Specific Gravity of Iodine Pentoxide 129 



Adsorption of Air by Iodine Pentoxide 130 



Purification of Iodic Acid and Silver for the Second Series of Analyses 132 



Method of Analyses 133 



Discussion of Results 13S 



IX. A RE\asioN OF the Atomic Weight of Chromium; The Analysis of Silver 

 Chromate. By G. P. Baxter, Ed. Mueller, and M. A. Hines. 



Introduction I39 



Purification of Materials 141 



Preparation of Silver Chromate 142 



Drying of Silver Chromate 144 



Determination of Silver in Silver Chromate 14S 



Determination of Moisture in Dried Silver Chromate I47 



Specific Gravity of Silver Chromate i49 



Discussion of Results 151 



