[ 253 ] 



VII. The Electrical Conductivity and other Properties of Sodium Hydroxide in 

 Aqueous Solution as Elucidating tJie Mechanism of Conduct-ion. 



By WILLIAM ROBERT BOUSFIELD, M.A., K.C., M.P., ami THOMAS MARTIN Lownv, 



D.Sc., Lecturer in Physical Clu'iiiiatry and Crystallography at the Central 



Technical College, South Kensington. 



Communicated by Professor HENEY E. ARMSTRONG, F.R.S. 



Received June '24, Read November 17, 1904. 



[C 5660, 6230. D 7250.] 



CONTENTS. 



Page 



Introduction 253 



Part I. Preparation of concentrated standard solutions of sodium hydroxide from metallic 



sodium 257 



Part II. Determination of the density of aqueous solutions of sodium hydroxide at 18* C. . 265 



Part III. Influence of temperature on the density of aqueous solutions of sodium hydroxide . 271 



Part IV. The molecular volume of sodium hydroxide in aqueous solution 280 



Part V. The conductivity of sodium hydroxide in aqueous solution at 18" C 283 



Part VI. The viscosity ami intrinsic conductivity of aqueous solutions of sodium hydroxide . 289 



Part VII. Influence of temperature on the conductivity of aqueous solutions of sodium hydroxide 295 



1) OoOO XiiOU. Prvpurutiou from metallic todiuiu of cuuccutratcd ttaiiiUnl solutions. 



D 7100. Densities of aqueous solutions of sodium hydroxide. 



D 7250. Conductivity (electrical) of solutions of eodium hydroxide correlated with other properties. 



INTRODUCTION. 



IN very dilute solutions the relationship between solvent and solute is such as to 

 admit of simple and exact mathematical treatment, and it is in this Held that the 

 theory of electrolytic dissociation has been applied with the greatest success. Until 

 recently it was generally believed that the formula) deduced from a consideration of 

 the properties of very dilute solutions could be applied without any serious loss of 

 accuracy to solutions of moderate concentration. This hope has, however, not been 

 realised. A careful comparative study, especially by WHETHAM and by GRIFFITHS, 

 of the electrical and osmotic properties of dilute solutions has shown that even at 

 concentrations as low as O'Ol gram-molecule per litre there is a discrepancy between 

 (378.) 23.2.05 



