﻿874 
  Mr. 
  B.W. 
  Clack 
  on 
  the 
  

  

  L=4'00 
  cms. 
  A=1'694 
  sq. 
  cms. 
  N=gms. 
  KC1 
  per 
  c.c. 
  solution 
  at 
  0° 
  0. 
  

  

  Experiment. 
  

  

  N. 
  

  

  iAxlO 
  6 
  . 
  

  

  £ 
  ■ 
  LO 
  5 
  . 
  

  

  Mean 
  k 
  X 
  10 
  5 
  . 
  

  

  Approx. 
  

   concentration. 
  

  

  : 
  

  

  •1975 
  

  

  •1975 
  

  

  •1034 
  

   1021 
  

  

  •4748 
  

   •4S10 
  

  

  •25 
  1 
  8 
  

   •2491 
  

  

  •966 
  

   •978 
  

  

  •953 
  

   ■956 
  

  

  i 
  -972 
  

   I 
  "954 
  

  

  20 
  p. 
  cent. 
  

   10 
  p. 
  cent. 
  

  

  26 
  

  

  27 
  

  

  

  

  

  8. 
  Earlier 
  Method 
  of 
  Experiment, 
  

  

  It 
  mighi 
  be 
  mentioned 
  that 
  a 
  number 
  of 
  experiments 
  were 
  

   carried 
  out 
  by 
  a 
  somewhat 
  different 
  method, 
  denoted 
  in 
  the 
  

   following 
  section 
  as 
  Method 
  A. 
  

  

  The 
  diffusion 
  apparatus, 
  filled 
  with 
  distilled 
  water, 
  was 
  

   inverted. 
  SO 
  that 
  the 
  smaller 
  bulb 
  A 
  (fig. 
  2) 
  was 
  uppermost, 
  

   in 
  a 
  solution 
  of 
  the 
  salt 
  under 
  investigation, 
  thus 
  allowing 
  

   the 
  salt 
  to 
  diffuse 
  into 
  instead 
  of 
  out 
  of 
  the 
  apparatus, 
  and 
  

   the 
  resultant 
  rate 
  of 
  increase 
  in 
  weight 
  was 
  determined. 
  

  

  Some 
  of 
  the 
  results 
  obtained 
  with 
  solutions 
  of 
  KC1 
  by 
  

   this 
  method 
  are 
  given 
  in 
  the 
  next 
  table 
  in 
  order 
  to 
  indicate 
  

   the 
  agreement. 
  

  

  L 
  = 
  400 
  cms. 
  

  

  A 
  =1-694 
  sq. 
  cms. 
  

  

  N 
  = 
  gms 
  

  

  . 
  KC1 
  per 
  c.c. 
  solution 
  at 
  0° 
  C. 
  

  

  Experiment. 
  

  

  N. 
  

  

  i'AxlO 
  6 
  . 
  *X10 
  5 
  . 
  Mean/ 
  t 
  -xl0\ 
  

  

  Approx. 
  

   concentration. 
  

  

  8 
  

  

  •1997 
  

   •1997 
  

  

  •1014 
  

   •1016 
  

  

  •5729 
  

   •5703 
  

  

  •2786 
  

   •2799 
  

  

  1011 
  i 
  

  

  1-009 
  

   1-007 
  

  

  20 
  p. 
  cent, 
  

   10 
  p. 
  cent. 
  

  

  9 
  

  

  10 
  

  

  •952 
  

  

  

  11 
  

  

  I 
  -953 
  

   •955 
  

  

  

  

  

  If 
  the 
  results 
  of 
  Experiments 
  26 
  and 
  21 
  be 
  compared 
  with 
  

   those 
  of 
  10 
  and 
  11, 
  it 
  will 
  be 
  seen 
  that 
  the 
  agreement 
  in 
  the 
  

   case 
  of 
  the 
  10 
  per 
  cent, 
  solution 
  is 
  almost 
  perfect, 
  but 
  it 
  is 
  

   not 
  quite 
  so 
  satisfactory 
  in 
  the 
  case 
  of 
  the 
  20 
  per 
  cent. 
  

   solution, 
  for 
  there 
  is 
  a 
  difference 
  of 
  3 
  per 
  cent. 
  The 
  actual 
  

   measurements 
  are 
  believed 
  to 
  be 
  more 
  accurate 
  than 
  this. 
  

  

  Some 
  of 
  the 
  difference 
  may 
  be 
  due 
  to 
  uncertainty 
  in 
  the 
  

   value 
  of 
  S, 
  but 
  this 
  would 
  not 
  produce 
  so 
  great 
  an 
  error 
  as 
  

   3 
  per 
  cent. 
  It 
  may 
  be 
  that 
  part 
  of 
  the 
  difference 
  is 
  due 
  to 
  

  

  