19 04. ] On Liquefied Hydrides as Conducting Solvents. 45 L 







Hydriodic Acid. 







T. 



P. 



T. 



P. 



T. 



P. 



- 77-9 



74-0 



-54-8 



303-5 



-43-5 



530 



- 73-5 



92-0 



-51-4 



369-0 



-41-7 



578 



- 68-4 



126-0 



-50-0 



376-0 



-39-4 



644 



- 63-5 



185-5 



-47-7 



438-0 



-36-9 



713 



- 59-5 



224-0 



-46-1 



474-0 



-35-9 



769 







Sulphuretted Hydrogen. 







- 84-0 



193-0 



-75-6 



314-0 



-69-1 



456 



- 81-7 ' 



220-0 



-73-3 



364-0 



-66-1 



538 



- 78-4 



270-0 



-71-6 



400-0 



-62-2 



676 





Phosphoretted Hydrogen. 







-105-9 



237-0 



-97-7 



393-0 



-88-6 



644 



- 101-2 



319-0 



-93-1 



498-0 



-86-6 



719 



The melting and boiling points as read from the curves are as 

 follows : — 



HC1. HBr. HI. H 2 S. H 3 P. 



M.p . — -86-0 -50-8 — — 



B. p -82-9 -68-7 -35-7 -60-1, -86-2 



2. — The Densities. 



The densities of the pure liquids were determined over a wide range 

 of temperature, and the values at the boiling point are given in the 

 following table : — 



HC1. HBr. HI. H 2 S. H 3 P. 



Density at b.p 1-195 2-157 2'799 0'964 0*744 



3. — The Molecular Surface Energy. 



The surface energies were measured over a considerable range of 

 temperature, using a modification of the method of Ramsay and 

 Shields. In the table the value of the molecular surface energy 

 A.(MV)t at various temperatures is given. The values of d\.(JslY)^/dT 

 and of the association factor x are tabulated separately. From the 

 results it will be seen that of the substances examined, hydrogen, 

 bromide, iodide, and sulphide occur as simple molecules ; whilst hydrogen 

 chloride and phosphide are more or less associated. 



