226 



Mr. R. F. D'Arcy on the 



were drawn, similar to those given in fig. 1 for sulphuric 

 acid. The curves given in fig. 3 are derived from these just 

 as those in fig. 2 are obtained from fig. 1. 



These curves show clearly that the hydrate is not com- 

 pletely dissociated in the solutions used at these temperatures, 

 this is in accordance with the difficulty experienced in sepa- 

 rating water from acetic acid by distillation. 



Acetic-acid Solutions. 

 Table VI.— Solution I. 99-1% C 2 H 4 2 , -9 H 2 0. 



Temperature. 



Time. 



Seconds (t). 



Pressure. 



Cm. of water 



at 20° (p). 



pxt 

 1000' 



Viscosity. 

 Water at 20° = 1. 



o 

 21 

 29-7 

 39-4 

 57-3 

 49-4 

 673 

 82-5 



867 



757-5 



658 



528-5 



578 



471 



403 



32-48 

 32-48 

 32 48 

 32-48 

 32-53 

 32-59 

 32-60 



28-16 

 24-60 

 21-37 

 17-16 

 1880 

 1535 

 1314 



1-21 

 1-06 

 •921 

 •740 



•810 

 •662 

 •566 



Table VII.— Solution II. 93-8 C 2 H,0 2) 6*2 H 2 0. 



Temperature. 



Time. 

 Seconds (t). 



Pressure. 



Cm. of water 



at 20° (p). 



pxt 

 1000* 



Viscosity. 

 Water at 20° = 1. 



O 



20 

 299 

 39-4 

 49-5 



58-1 

 69-5 



82-2 



1497-5 

 1207-5 

 1009 



843-5 



735 



622-5 



531-5 



2961 

 29-61 



29-57 

 29-57 

 29-57 

 29-60 

 29-60 



44 36 

 35-76 

 29 82 

 24-93 

 21-73 

 18-43 

 15-73 



1-91 

 1-54 

 1-28 

 107 

 •915 

 •794 

 •678 



Table VIII.— Soluth 



m III. 88-24 C 2 H 4 2 , 



11-76 H 2 0. 



Temperature. 



Time. 

 Seconds (t). 



Pressure. 



Cm. of water 



at 20° (p). 



pxt 

 1000' 



Viscosity. 

 Water at 20° = 1. 



20°1 



1938 



28-79 



55-81 



2-41 



29-85 



1518 



28-86 



43-8 



1-89 



39-5 



1222 



28-88 



353 



1-52 



49-9 



995-5 



28-88 



28-75 



1-24 



59-5 



841-5 



28-91 



24-33 



1-05 



76-2 



682-5 



28-87 



18-84 



•812 



65-7 



766 



28-87 



2212 



•953 



