✦ LIBER ✦

A theory on the effect of low molecular salts on the dissociation of linear polyacids

✍ Scribed by Fumio Oosawa

Publisher: Wiley (John Wiley & Sons)
Year: 1968
Tongue: English
Weight: 512 KB
Volume: 6
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1968.360060112

No coin nor oath required. For personal study only.

✦ Synopsis

A theoretical analysis is given on the effect of low molecular salts on the titratioii behavior of partially neutralized linear polyacids or polybases. 0 1 1 the basis of the additivity law experimentally and theoret.ically established on the activity of corinteriolis in polyelectrolyte solutions containing salts, the chemical potential of alkali added for neutralization of polyacids is derived as a function of the salt concentration. The relation between the pH and the salt concentration at, coilstant degree of iieutralizatioii is expressed by PH(c~) -pH( 0) = ( ( [ b ( ~p ~a ) / b c a I / ~o s l -1 ) 111 + ( ~o s ~s / ~p ~a ) l

where ca is the concentration of alkali, cs the concentration of salts, y p is the aclivity coefficient of coiinterions in the absence of salts and yOs is that in the absence of polyelectrolytes. This relation is found to be in good argeement with experimental data obtained in synthetic linear polyelectrolytes as well as in rodlike charged proteins. Therefore, it is concluded that the titration behavior of linear polyions can be widerstood from the special feat,ure of the integrated coillonib interxtion between lincar polyioiis and small ions which was essential for the additivity law. I I I additioii, the screeniiig effect of salts oil the electric potential arouiid the polyion is discussed.

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