McKay-Perring calculations

Isopiestic ratios for McKay-Perring calculations of activity coefficients... 

The lowering of the conductivity is not attributed to a change in the degree of ionization of the soln., but rather to the decreased mobility of the anions during the change from I to I3. At 25°, the mobility of the T-ion is 76 5 and of the I3 -ion, 410. The diffusion constant of I3 -ions, according to E. Brunner, is 0 9 per sq. cm. per day at 20°, that is, approximately the same as that of free iodine. When iodine dissolves in potassium iodide soln., W. C. Bray and G. M. J. McKay calculate that there is an expansion of 0 2376 c.c. per gram of iodine or 60 31 c.c. per mol. of iodine per litre of soln. The colour of dil. soln. of potassium tri-iodide is yellowish-brown which with increased cone, becomes very dark blue, almost opaque, in thin layers dark red. 

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See also in sourсe #XX -- [ ]

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