﻿Ionic 
  and 
  Thermal 
  Coefficients 
  of 
  Nitric 
  Acid. 
  121 
  

  

  Percentage. 
  

  

  axlO- 
  6 
  , 
  

   4°-14°-2. 
  

  

  ax 
  10-6. 
  

   14°'2-24°-2. 
  

  

  Percentage. 
  

  

  axiO~ 
  6 
  . 
  

   4°-14°-2. 
  

  

  axlO" 
  6 
  . 
  

   14°-2-24°-2. 
  

  

  0625 
  

  

  100 
  

  

  158 
  

  

  56-29 
  

  

  980 
  

  

  950 
  

  

  2-732 
  

  

  150 
  

  

  241 
  

  

  58-32 
  

  

  

  950 
  

  

  4-595 
  

  

  205 
  

  

  246 
  

  

  60-42 
  

  

  i'ooo 
  

  

  

  7-585 
  

  

  283 
  

  

  265 
  

  

  60-60 
  

  

  

  "990 
  

  

  10-75 
  

  

  341 
  

  

  370 
  

  

  62-84 
  

  

  

  1038 
  

  

  13-99 
  

  

  391 
  

  

  403 
  

  

  65-80 
  

  

  1058 
  

  

  1043 
  

  

  1495 
  

  

  402 
  

  

  446 
  

  

  67-85 
  

  

  

  1060 
  

  

  16-88 
  

  

  428 
  

  

  455 
  

  

  71-60 
  

  

  1054 
  

  

  

  18-44 
  

  

  476 
  

  

  525 
  

  

  75-64 
  

  

  1088 
  

  

  1076 
  

  

  1932 
  

  

  484 
  

  

  

  76-55 
  

  

  1088 
  

  

  1076 
  

  

  23-89 
  

  

  540 
  

  

  542 
  

  

  78-22 
  

  

  1095 
  

  

  

  25-50 
  

  

  550 
  

  

  585 
  

  

  81-93 
  

  

  1143 
  

  

  1093 
  

  

  28-97 
  

  

  629 
  

  

  608 
  

  

  85-21 
  

  

  1143 
  

  

  1096 
  

  

  30-17 
  

  

  647 
  

  

  637 
  

  

  87-90 
  

  

  

  1096 
  

  

  33-55 
  

  

  700 
  

  

  672 
  

  

  92-24 
  

  

  1200 
  

  

  1141 
  

  

  38-10 
  

  

  770 
  

  

  

  9404 
  

  

  1200 
  

  

  1141 
  

  

  42-33 
  

  

  817 
  

  

  790 
  

  

  95-62 
  

  

  1200 
  

  

  1141 
  

  

  44-41 
  

  

  847 
  

  

  801 
  

  

  96-64 
  

  

  1222 
  

  

  1172 
  

  

  46-56 
  

  

  864 
  

  

  817 
  

  

  97-33 
  

  

  

  1190 
  

  

  51-24 
  

  

  942 
  

  

  907 
  

  

  98-07 
  

  

  1250 
  

  

  1210 
  

  

  54-60 
  

  

  980 
  

  

  950 
  

  

  100-00 
  

  

  1274 
  

  

  1240 
  

  

  The 
  value 
  obtained 
  for 
  the 
  100-per-cent. 
  acid 
  for 
  the 
  

   temperature-limit 
  4°-14°, 
  namely 
  '001274, 
  approximates 
  very 
  

   closely 
  to 
  that 
  obtained 
  by 
  Kolb, 
  namely 
  '001263 
  between 
  

   the 
  limits 
  0°-15° 
  ; 
  but 
  it 
  appears 
  that 
  he 
  made 
  an 
  arithmetical 
  

   mistake 
  in 
  referring 
  to 
  the 
  value 
  as 
  about 
  three 
  times 
  as 
  great 
  

   as 
  the 
  mean 
  coefficient 
  of 
  water 
  between 
  the 
  same 
  limits; 
  

   this 
  latter, 
  according 
  to 
  Rosetti's 
  tables, 
  is 
  '000047, 
  so 
  that 
  

   the 
  value 
  for 
  nitric 
  acid 
  is 
  nearly 
  thirty 
  times 
  as 
  great 
  

   (actually 
  27- 
  1). 
  

  

  The 
  above 
  results 
  show 
  that 
  as 
  regards 
  the 
  mean 
  coefficient 
  

   of 
  expansion, 
  nitric 
  acid 
  of 
  different 
  concentrations 
  does 
  

   not 
  behave 
  as 
  if 
  it 
  were 
  a 
  mere 
  mixture 
  of 
  the 
  acid 
  and 
  

   water. 
  

  

  The 
  following 
  selected 
  values 
  illustrate 
  this 
  point 
  : 
  — 
  

  

  Sum 
  of 
  Coefficients 
  Coefficient 
  found 
  

  

  Percentage. 
  calculated 
  at 
  4°-14°-2. 
  at 
  4°-14°-2. 
  

  

  10-75 
  180 
  XlO" 
  6 
  341 
  xl0~ 
  6 
  

  

  30-17 
  417 
  xlO- 
  6 
  647 
  xlO" 
  6 
  

  

  51-24 
  676 
  xlO" 
  6 
  942 
  x 
  10" 
  6 
  

  

  75-64 
  978 
  xlO" 
  6 
  1088 
  x 
  10 
  ~ 
  6 
  

  

  94-04 
  1126 
  x 
  10- 
  6 
  1200 
  x 
  10~ 
  6 
  

  

  In 
  every 
  case 
  the 
  found 
  value 
  exceeds 
  that 
  calculated, 
  

   though 
  the 
  difference 
  decreases 
  as 
  the 
  percentage-concen- 
  

   tration 
  increases. 
  

  

  Though 
  there 
  seems 
  to 
  be 
  no 
  simple 
  relation 
  between 
  the 
  

  

  