﻿342 
  

  

  C. 
  L. 
  Sjpeyers 
  — 
  Boiling 
  Point 
  Curves. 
  

  

  80° 
  

  

  T!F+- 
  

  

  - 
  *» 
  ■ 
  1 
  

  

  

  2 
  

  

  

  

  70° 
  

  

  \1k 
  

  

  

  

  -» 
  =£- 
  

  

  

  "* 
  * 
  j^ 
  

  

  fi0° 
  

  

  

  

  

  

  

  cc^ 
  

  

  •w 
  

  

  boiling 
  point 
  plot. 
  The 
  data 
  recently 
  obtained 
  by 
  Haywood- 
  

   are 
  shown 
  by 
  dots. 
  

  

  The 
  boiling 
  point 
  curve 
  for 
  a 
  mixture 
  of 
  chloroform 
  and 
  

   carbon 
  tetrachlorid 
  has 
  been 
  plotted, 
  plot 
  II 
  of 
  tig. 
  2, 
  under 
  

   the 
  assumption 
  that 
  these 
  liquids 
  have 
  normal 
  molecular 
  

   weights 
  in 
  this 
  mixture, 
  an 
  assumption 
  which 
  is 
  allowable 
  since 
  

   each 
  has 
  a 
  normal 
  molecular 
  weight 
  in 
  benzene, 
  f 
  The 
  experi- 
  

   mental 
  values 
  are 
  given 
  by 
  Thayer 
  J 
  and 
  marked 
  as 
  before 
  by 
  

   dots, 
  the 
  theoretical 
  values 
  being 
  denoted 
  by 
  x. 
  The 
  agreement 
  

   is 
  good 
  except 
  at 
  the 
  beginning, 
  but 
  Thayer's 
  chloroform 
  

   boiled 
  at 
  a 
  considerably 
  higher 
  temperature 
  than 
  that 
  given 
  by 
  

   Winkelmann 
  quoting 
  Regnault. 
  

  

  The 
  boiling 
  point 
  curve 
  for 
  a 
  mixture 
  of 
  benzene 
  and 
  chloro- 
  

   form 
  has 
  been 
  plotted 
  in 
  fig. 
  3, 
  the 
  theoretical 
  values 
  and 
  the 
  

  

  70° 
  

  

  C 
  b 
  H 
  b 
  

  

  

  

  

  ——■ 
  " 
  *^«5 
  

  

  experimental 
  values 
  by 
  Haywoodf 
  are 
  marked 
  as 
  in 
  fig. 
  2. 
  

   The 
  agreement 
  is 
  not 
  good, 
  but 
  when 
  a 
  correction 
  is 
  made 
  for 
  

   the 
  boiling 
  point 
  of 
  chloroform, 
  the 
  agreement 
  becomes 
  better. 
  

   A 
  more 
  complicated 
  boiling 
  point 
  curve 
  is 
  that 
  of 
  the 
  mix- 
  

   ture 
  of 
  benzene 
  and 
  ethyl 
  alcohol. 
  From 
  Lehfeldt's 
  datag 
  it 
  

   seems 
  probable 
  that 
  the 
  molecular 
  weights 
  of 
  both 
  alcohol 
  and 
  

   of 
  benzene 
  are 
  quite 
  complex 
  in 
  this 
  mixture. 
  The 
  tempera- 
  

   ture 
  of 
  Lehfeldt's 
  experiments 
  was 
  50° 
  C, 
  so 
  that 
  to 
  use 
  the 
  

   values 
  obtained 
  at 
  this 
  temperature 
  at 
  a 
  so 
  much 
  higher 
  tem- 
  

   perature 
  as 
  the 
  boiling 
  temperature 
  of 
  the 
  mixture 
  means 
  to 
  

   introduce 
  an 
  error, 
  but 
  the 
  error 
  seems 
  to 
  be 
  inappreciable. 
  

   The 
  curve 
  is 
  shown 
  in 
  fig. 
  4, 
  the 
  same 
  marks 
  being 
  used 
  to 
  

   distinguish 
  between 
  theory 
  and 
  observation 
  as 
  before, 
  the 
  

  

  * 
  Journ. 
  Am. 
  Chem. 
  Soc, 
  xxi, 
  994, 
  1899. 
  

  

  f 
  Journ. 
  Phys. 
  Chem., 
  ii, 
  347, 
  1898 
  ; 
  Journ. 
  Am. 
  Chem. 
  Soc, 
  xxi, 
  282, 
  1898. 
  

  

  % 
  Journ. 
  Phys. 
  Chem., 
  iii, 
  317, 
  1899. 
  

  

  § 
  Phil. 
  Mag., 
  xlvi, 
  42, 
  1898. 
  

  

  