Osmotic Properties of Solutions of Some Typical Colloidal Electrolytes.

Abstract

The best value (from Levy) for the dissociation constant of the acid R(IH+)NH2FCOO~, is 7'30, and Greenstein gives 9'10 for K>. La turns out to be 4.16 X 104, a figure which is consistent with the characteristics of figure 1. L23 is ¿i3 X 4.52, or 1.45 X 10s.A comparison of the constants calculated by Levy and those given in this paper is given in table 4. In every case in which comparable values are reported, the agreement of the values calculated by the authors with those given previously is quite satisfactory. SUMMARYThe polarimetric method has been applied to the study of the equilibria between histidine and formaldehyde. Contrary to previous reports, evidence is presented to show that each of the three ionic forms of histidine reacts with first one, and then another mole of formaldehyde. The calculation of the values of five equilibrium constants which characterize these reactions has been described. The values of these constants are in good agreement with the comparable values which have been reported previously.REFERENCES (1)

The Effect of Alkaline Electrolytes on Micelle Formation in Soap Solutions

“…The osmotic data of McBain and Bolduan at 0°C. (13) likewise indicate that micelle formation Fig. 2.…”

Surface Tensions of Aqueous Solutions of Two Foam-Fractionated Detergents.

“…However, certain regularities noted elsewhere may be used. It has been found (10) that the osmotic coefficient vs. concentration curves of colloidal electrolytes can be divided into classes according to the value of the derivative dg/d In ci = f{g), where g is the osmotic coefficient and f(g) a function of g alone. All the straight-chain salts for which data are available have the same value of jig); all the branchedchain salts, including the Aerosols and the kinked-chain potassium oleate, another.…”

Micelle Structure in Aqueous Solutions of Colloidal Electrolytes.

“…Several papers (6,20) describing some of the solution properties of Aerosol MA have appeared since the work reported here was initiated. They show that the "Aerosol''-type compounds are colloidal electrolytes, and that the "Aerosols" and other branched-chain compounds differ from members of the straightchain type in the degree to which certain properties depend upon chain length (21).…”