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[E]
A Lock for Flint: Diameter & Conductivity. S.H. Shakman
For a majority of eight (hydrated) ions listed*, diameter* &
conductivity** may be approximated as cube-root of volume &
inverse-square-root of weight, resp., of fully-hydrated ions per
Flint***. Anomolous results may be improved (alt.) for (a) both
size and conductivity of Cl- by assuming hydration number [H] of
half the prescribed maximum; (b) conductivity of SO4-- by assuming
it anhydrous when measured for
conductivity; & (c) diameter of IONIC SIZE AND CONDUCTIVITY
HPO4-- by speculatively deriv- Ion Diameter Conductivity
ing it as the cube-root of 2 Obs* Calc Ob** Calc H
fully-hydrated ionic volumes. Cl- .96 1.28 76.3 59.4 7
Assumptions in (a) & (b) " alt. .96 1.04 76.3 76.6 3.5
above, assigned to Cl- & Na+ K+ 1.00 1.02 73.5 76.9 3
ions resp., yield approxima- Na+ BASE 1.47 1.47 50.1 50.1 11
tions of specific gravities HCO3- 1.65 1.66 44.5 40.0 16
for NaCl solutions comparable CH3COO- 1.80 1.68 40.9 40.0 16
to those previously reported SO4-- 1.84 1.89 80 33.2 23
for 5 other solutes assumed " alt. 80 77.8 0
to be fully-hydrated (error H2PO4- 2.04 1.84 33 34.3 21
values for all 6 also de- HPO4-- 2.58 1.89 33 33.2 23
scribe regular curves).**** " alt. 2.58 2.39
*GANONG, W. F., Review of Medical Physiology (1975) 12. ** CRC
(1985-6) D167-8. ***FLINT,L.H., Behavior Patterns of
Hydration (1964) 21-30: Wa[anhydrous weight]=2(atomic # +-
valence); Wh[hydrated weight]=Wa+18H; H[hydration#] =23n-(
atomic # +-valence) [H=23 to 0, n=1 to 4]; Vh[hydrated vol-
ume]=Wh/{1+(Wa/Wh)}. ****SHAKMAN, S.H., AAAS (1987) #113.
AAAS Pacific Div. Proceedings Vol.7(1988), p. 42.
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