CONTENTS 



A REVISION OF THE ATOMIC WEIGHT OF POTASSIUM ; THE ANALYSIS OF POTAS- 

 sic CHLORIDE. BY T. W. RICHARDS AND ARTHUR STAEHLER. 



Page 



Introduction 7 



Preparation of the Material 9-14 



Potassic Chloride 



Argentic Nitrate 



Silver 13 



Nitric and Hydrochloric Acids 14 



Water 14 



The Drying and Weighing of the Potassic Chloride 14-16 



The Precipitation and Weighing of Argentic Chloride 17-21 



The Ratio of Potassic to Argentic Chloride 



The Ratio of Potassic Chloride to Silver 



Discussion of Final Results 



Summary 



A REVISION OF THE ATOMIC WEIGHT OF POTASSIUM ; THE ANALYSIS OF POTAS- 

 SIC BROMIDE. BY T. W. RICHARDS AND EDWARD MUELLER. 



Introduction 



The Preparation of Materials 



The Source of the Potassium 28-30 



Bromine 



Potassic Bromide 31-34 



Silver 34-35 



Nitric acid 35 



Water 35 



The Laboratory 



Utensils 35 



The Drying and Weighing of Potassic Bromide 36-38 



The Precipitation and Weighing of Argentic Bromide 38-40 



The Ratio of Argentic Bromide to Potassic Bromide 40 



The Determination of the Silver Needed for Precipitation 41-42 



The Ratio of Potassic Bromide to Silver 42 



The Atomic Weight of Potassium 43 



Summary 44 



THE QUANTITATIVE SYNTHESIS OF ARGENTIC NITRATE AND THE ATOMIC 

 WEIGHTS OF NITROGEN AND SILVER. BY T. W. RICHARDS AND G. S. FORBES. 



Introduction 47 



Preparation of Pure Materials 47-49 



Nitric Acid 47 



Silver 48 



Water 49 



Air 49 



The Synthesis of Argentic Nitrate 50-54 



3 



