﻿and 
  Chemical 
  Reactions 
  in 
  Heterogeneous 
  Systems. 
  555 
  

  

  la 
  the 
  following 
  table 
  — 
  

  

  h' 
  gives 
  the 
  number 
  of 
  cc. 
  Baryta 
  requisite 
  for 
  neutralization 
  of 
  

  

  10 
  cc. 
  of 
  the 
  benzoic 
  acid 
  in 
  solution. 
  

   Cj 
  gives 
  the 
  concentration 
  of 
  benzoic 
  acid 
  in 
  solution 
  at 
  the 
  time 
  r, 
  

  

  if 
  the 
  concentration 
  of 
  the 
  benzoic 
  acid 
  solution 
  saturated 
  at 
  

  

  17°'5 
  C. 
  is 
  taken 
  as 
  unit 
  and 
  10 
  cc. 
  are 
  put 
  equal 
  to 
  10. 
  

   V 
  is 
  the 
  volume 
  of 
  the 
  solution 
  at 
  the 
  time 
  r. 
  

   C 
  is 
  the 
  concentration 
  of 
  the 
  benzoic 
  acid 
  at 
  the 
  given 
  temperature, 
  

  

  expressed 
  in 
  unit 
  concentrations 
  of 
  the 
  benzoic 
  acid 
  saturated 
  

  

  at 
  17°'5 
  C, 
  which 
  we 
  denote 
  with 
  letter 
  (a). 
  

  

  A 
  is 
  — 
  In 
  - 
  — 
  -J 
  or 
  the 
  velocity 
  constant 
  of 
  the 
  reaction 
  of 
  solution 
  

   of 
  benzoic 
  acid. 
  

  

  Table 
  I. 
  

  

  Influence 
  of 
  Temperature 
  upon 
  the 
  Velocity 
  Constant 
  of 
  Molecular 
  

   Reactions 
  at 
  different 
  Temperatures. 
  (Speed 
  of 
  solution 
  of 
  benzoic 
  

   acid 
  in 
  water 
  at 
  60° 
  C, 
  40° 
  C, 
  31° 
  C, 
  17°-5 
  C, 
  l°-5 
  C.) 
  

  

  Xo. 
  

  

  b\ 
  

  

  c. 
  

  

  c-c^. 
  

  

  Speed 
  of 
  solution 
  of 
  benzoic 
  acid 
  in 
  ivater 
  at 
  60° 
  C. 
  

  

  1 
  

  

  0-843 
  

  

  3-338 
  

  

  1490 
  

  

  41-862 
  

  

  10 
  

  

  8-797 
  

  

  2 
  

  

  1-449 
  

  

  5-738 
  

  

  1480 
  

  

  39-462 
  

  

  10 
  

  

  9-327 
  

  

  3 
  ... 
  

  

  2058 
  

  

  8-150 
  

  

  1470 
  

  

  37-050 
  

  

  10 
  

  

  10-610 
  

  

  4 
  ... 
  

  

  2-711 
  

  

  10-73 
  

  

  1460 
  

  

  34-47 
  

  

  10 
  

  

  9-487 
  

  

  5 
  ... 
  

  

  3-259 
  

  

  12-90 
  

  

  1450 
  

  

  32-30 
  

  

  10 
  

  

  9-947 
  

  

  6 
  ... 
  

  

  3-798 
  

  

  15-04 
  

  

  1440 
  

  

  30-16 
  

  

  10 
  

  

  10-340 
  

  

  / 
  ... 
  

  

  4-325 
  

  

  1713 
  

  

  

  28-07 
  

  

  

  

  14th 
  May, 
  1907. 
  

  

  T=333°. 
  

  

  C 
  at 
  equilibrium 
  at 
  60° 
  C. 
  

   = 
  1-2132 
  gr. 
  in 
  100 
  cc. 
  of 
  

   water 
  ; 
  i. 
  e. 
  10 
  cc. 
  of 
  the 
  

   saturated 
  solution 
  = 
  45-2 
  cc. 
  

   of 
  (a). 
  

  

  n 
  = 
  lSO 
  rev. 
  per 
  minute. 
  

  

  Corr. 
  for 
  water 
  =0-05 
  cc. 
  

  

  Pipette=10 
  cc. 
  

  

  Average 
  ... 
  9 
  '946 
  

   Speed 
  of 
  solution 
  of 
  benzoic 
  acid 
  in 
  ivater 
  at 
  40° 
  C. 
  

  

  

  0-428 
  

  

  1-695 
  

  

  1470 
  

  

  18-985 
  

  

  42 
  

  

  5-0S9 
  

  

  

  1-077 
  

  

  4-265 
  

  

  1450 
  

  

  16-415 
  

  

  22 
  

  

  5-775 
  1 
  

  

  

  1-425 
  

  

  5-642 
  

  

  1440 
  

  

  15038 
  

  

  30 
  

  

  5-543 
  , 
  

  

  

  1-839 
  

  

  7-282 
  

  

  1430 
  

  

  13-398 
  

  

  31 
  

  

  5-883 
  

  

  •• 
  

  

  2-244 
  

  

  8-886 
  

  

  1420 
  

  

  11-794 
  

  

  30 
  

  

  5-819 
  \ 
  

  

  

  2-588 
  

  

  10-250 
  

  

  

  10-430 
  

  

  

  1 
  

  

  2l8t 
  May, 
  1907. 
  

  

  T=313°. 
  

  

  C 
  at 
  equilibrium 
  at 
  40° 
  C. 
  

   =0-5551 
  gr. 
  in 
  100 
  cc. 
  of 
  

   water 
  ; 
  i. 
  e. 
  10 
  cc. 
  of 
  the 
  

   sat. 
  sol. 
  = 
  20-68 
  cc. 
  of 
  (a). 
  

  

  ?2 
  = 
  130 
  rev. 
  per 
  minute. 
  

  

  Corr. 
  for 
  waters 
  0*03 
  cc. 
  

  

  Pipette 
  =10 
  cc. 
  

  

  Average 
  ... 
  5-756 
  

  

  2P 
  2 
  

  

  