﻿The 
  Ionic 
  and 
  Thermal 
  Coefficients 
  of 
  Nitric 
  Acid. 
  119 
  

  

  as 
  other 
  electrolytes 
  in 
  possessing 
  a 
  positive 
  temperature- 
  

   coefficient 
  for 
  concentrations 
  ivp 
  to 
  96 
  per 
  cent., 
  yet 
  beyond 
  

   this 
  point 
  it 
  behaves 
  as 
  a 
  metallic 
  conductor 
  in 
  possessing 
  

   a 
  negative 
  temperature- 
  coefficient. 
  

  

  Table 
  I. 
  

  

  Percentage 
  

   Proportion. 
  

  

  Molecular 
  

   Dilution. 
  

  

  f*13 
  

  

  in 
  mercury 
  

   units 
  X 
  10 
  T 
  . 
  

  

  tlL. 
  

  

  1-30 
  

  

  4-568 
  

  

  288-0 
  

  

  0-885 
  

  

  3-12 
  

  

  1-956 
  

  

  281-5 
  

  

  0-865 
  

  

  5-99 
  

  

  1-164 
  

  

  258-9 
  

  

  0-796 
  

  

  1013 
  

  

  0-559 
  

  

  228-0 
  

  

  0701 
  

  

  15-32 
  

  

  0-349 
  

  

  1901 
  

  

  0-571 
  

  

  2011 
  

  

  0-251 
  

  

  159-3 
  

  

  0-487 
  

  

  25-96 
  

  

  0-180 
  

  

  123-5 
  

  

  0-379 
  

  

  30-42 
  

  

  0-144 
  

  

  100-1 
  

  

  0-308 
  

  

  33-81 
  

  

  0-123 
  

  

  85-8 
  

  

  0-263 
  

  

  35-90 
  

  

  0112 
  

  

  73-6 
  

  

  0-226 
  

  

  39-48 
  

  

  0-096 
  

  

  63-8 
  

  

  0196 
  

  

  4501 
  

  

  0-077 
  

  

  47-9 
  

  

  0-117 
  

  

  51-78 
  

  

  0-059 
  

  

  32-6 
  

  

  0-102 
  

  

  53-03 
  

  

  0-056 
  

  

  30-4 
  

  

  0-093 
  

  

  58-20 
  

  

  0-045 
  

  

  22-2 
  

  

  0-086 
  

  

  61-20 
  

  

  0-040 
  

  

  18-6 
  

  

  0-057 
  

  

  65-77 
  

  

  0-032 
  

  

  13-3 
  

  

  0-041 
  

  

  69-53 
  

  

  0-028 
  

  

  10-3 
  

  

  0032 
  

  

  73-82 
  

  

  0-022 
  

  

  6-43 
  

  

  0020 
  

  

  76-59 
  

  

  0019 
  

  

  5-03 
  

  

  0015 
  

  

  78-90 
  

  

  0-017 
  

  

  3-27 
  

  

  0-010 
  

  

  84-08 
  

  

  0012 
  

  

  1-09 
  

  

  0004 
  

  

  86-18 
  

  

  o-oio 
  

  

  0-94 
  

  

  0003 
  

  

  87-72 
  

  

  0007 
  

  

  0-62 
  

  

  0-002 
  

  

  89-92 
  

  

  0-007 
  

  

  0-36 
  

  

  0001 
  

  

  91-87 
  

  

  0006 
  

  

  0-17 
  

  

  00005 
  

  

  94-32 
  

  

  0-004 
  

  

  007 
  

  

  0-0002 
  

  

  96-12 
  

  

  0002 
  

  

  0035 
  

  

  o-oooi 
  

  

  98-50 
  

  

  o-ooi 
  

  

  0-016 
  

  

  0-00005 
  

  

  98-85 
  

  

  o-ooi 
  

  

  0-013 
  

  

  0-00004 
  

  

  99-27 
  

  

  0-001 
  

  

  0017 
  

  

  0-00005 
  

  

  99-97 
  

  

  

  

  0-007 
  

  

  000002 
  

  

  It 
  is 
  evident 
  that 
  this 
  phenomenon 
  cannot 
  be 
  explained 
  by 
  

   the 
  aid 
  of 
  the 
  ionic 
  dissociation 
  theory, 
  as 
  the 
  number 
  of 
  free 
  

   ions 
  would 
  not 
  exceed 
  four 
  per 
  1000. 
  As 
  we 
  have 
  observed 
  

   a 
  similar 
  abnormality 
  in 
  other 
  physical 
  properties, 
  and 
  espe- 
  

   cially 
  in 
  the 
  contractions 
  as 
  calculated 
  from 
  the 
  density 
  

   determinations, 
  we 
  consider 
  it 
  probable 
  that 
  the 
  result 
  is 
  due 
  

   to 
  an 
  incipient 
  formation 
  of 
  the 
  compound 
  2HN0 
  3 
  . 
  N 
  2 
  5 
  , 
  

   which 
  is 
  prepared 
  by 
  dissolving 
  nitrogen 
  pentoxide 
  in 
  an- 
  

   hydrous 
  nitric 
  acid. 
  

  

  