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       [B] 



     Conductivity of Positive Ions.  S.H. Shakman

 

A notable order of agreement between calculated and observed

conductivity values (within 10% for a majority of positive

inorganic ions listed by CRC*) may be derived when ions are

assigned [either anhydrous (a) or maximally hydrated (h)] weight

values (Wa,Wh) in accord with Flint's description of hydrational

potentiality**; and relative conductivities are calculated as

inverse square root of weight (in accord with Graham's law of

diffusion, as first treated by Flint***).



 Table  -  Equivalent Conductivity, Calculated vs Observed 

 Ion:            H+    Li+    Na+    K+   Rb+    Cs+   [H+:

 W(a or h)**     4(a) 350(h) 222(h) 94(h) 76(a) 112(a)  K+]

 1//W           .5000  .0535  .0671 .1031 .1147 .0945  4.85

 Calculated                 [BASE ] 

   Conductivity 373.1  39.9 [50.08] 77.0   85.6  70.5  4.85

 Observed       349.65 38.66 50.08  73.48  77.8  77.2  4.76

 

*CRC Handbook of Chemistry and Physics, 1985-6, D-167-8. 

**FLINT, L.H., Behavior Patterns of Hydration (1964), 21:     

Wa=2(atomic no.+/-valence); Wh=Wa+18H, when H=23n-(atomic  

no.+/-valence), H varies from 23 to 0 and n from 1 to 4. 

***FLINT, L.H., J. Washington Acad. of Sci., 22 (1932), 98.