﻿60S The Boiling- Points of Homologous Compounds. 



Summary, 



(1) A boiling-point formula is proposed for the normal 

 paraffins 



log = 1-929 (log M)' 4134 . • . . (a) 



which covers the range from 72 = 4 to ?i = 17 with an average 

 error of 0°-64. 



(2) An equation 



*V 12 °= 1-841 (£) 



is shown to hold for the normal paraffins betwen ethane and 

 decane with an average error of 0*33 per cent. 



(3) By eliminating between (/3) mid any of the various 

 boiling-point formulae, empirical equations are obtained for 

 the critical temperatures of the normal paraffins. In par- 

 ticular, the equation 



log C = '265O + 1-929 (log M)" 4134 - -120 log n . ( 7 ) 



is shown to be in very close agreement with the observed 

 facts. 



(4) The boiling-points of the primary alkyl bromides are 

 connected with those of the corresponding paraffins by the 

 equation 



0B = 0r+5?, (8) 



the mean error over the range ?* = 3 to n = S being o, 73. 



(5) A similar formula for the primary alcohols, viz.: 



gives the boiling-points of the alcohols over the range n = 3 

 to n = 10 with an average error of 2 o, 04. 



The writer hopes, with wider data, to extend these 

 formulae, especially as regards critical temperatures, to other 

 allied series. 



University College of North Wales, 

 Bangor. 

 January 1914. 



