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Specific Gravity of Aqueous Solutions. S.H. Shakman
Specific gravity (S.G.) for a number of solutes may be ap proximated using the equation: S.G.= ((1000+ [g/l / (1+ Waz/
Whz)])) /1000, as derived from Flint*; when g/l= grams/liter
anhydrous solute; Waz is the sum of anhydrous ionic weights (Wa),
each equal to: 2(atomic no. +/ valence); Whz is the sum of
hydrated ionic weights (Wh), each equal to: Wa+18H, when H
(hydration no.) = 23n  (atomic no. +/ valence), with H varying
from 23 to 0 and n from 1 to 4. For example, UO2(NO3)2 is assumed
to consist of U+6((Wa=196, Wh=196 [H = 23(4)  (92+6), thus U+6
does not hydrate])); 2 O(Wa=12, Wh=318); and 2 NO3(Wa=60,
Wh=348). Thus Waz=340, Whz=1528, Waz/Whz=.2225, and calculated
S.G. at 2% solute = (1000+ 20.34/1.2225) /1000 = 1.017. Table
below lists, for solutions of "A%" (220%) solute, observed and
calculated specific gravities and error (obs./calc.  1) for
UO2(NO3)2; and error values only for 4 other solutes.
Table  Specific Gravity of Aqueous Solutions A% UO2(NO3)2 MgI2 CdCl2 CaCl2 CoCl2 CdI2 CsBr
Obs.** g/l Calc. Error = (Observed**/Calculated  1)
2 1.017 20.34 1.017 .0000 .0015 .0019 .0010 .0008 .0010 .0016
4 1.036 41.44 1.034 .0019 .0013 .0015 .0005 .0002 .0004 .0015
8 1.072 85.76 1.070 .0019 .0012 .0010 .0004 .0007 .0003 .0014
12 1.110 133.20 1.109 .0009 .0010 .0007 .0013 .0012 .0006 .0015
16 1.149 183.84 1.150 .0009 .0009 .0012 .0026 .0013 .0010 .0016
20 1.194 238.80 1.195 .0008 .0010 .0014 .0048 .0005 .0015 .0018
*FLINT, L.H., Behavior Patterns of Hydration (1964), 21, 30.
**LANGE'S Handbook of Chemistry, 10th Ed. (1967), 116982.
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Copyright 19968S. H. Shakman. All
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[1987 AAAS Abstract #113; Copyright 1986 S.H.Shakman; Txu242823.
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