The assay of potassium p-phenolsulfonate, its pH range, and its ultraviolet absorption spectrum

Sager, E.E.; Schooley, M.R.; Acree, S. F.

doi:10.6028/jres.031.008

Cited by 4 publications

(14 citation statements)

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“….fJf havior for pure salts of sulfonic acids, which may be attributed ill part to the presence of "ion pairs" arising from the resonant, polar structure of the phenolsulfonates [8,9,32]. The value of at found here is nearly equal to Bjerrum's [23] critical value and may indicate, although not conclusively, that "ion pairs" are present.…”

Section: J Equals (E-eo)/(2 3026rt/f) + Log(mhmcl)supporting

confidence: 64%

“…Practically the same value was obtained by Sager, Schooley, and Acree by spectrophotometric methods [8]. If the sulfonic acid group were incompletely ionized, however, more of its molecules would be formed upon the addition of a strong acid to either the sulfonate salt or the free sulfonic acid, and the spectral absorption bands would show corresponding changes.…”

Section: Tautomeric Equilibria Of Phenol-sulfonic Acidsmentioning

confidence: 53%

“…MATERIALS Sodium p-phenolsulfonate obtained from a commercial source was recrystallized four times from distilled water and dried to constant weight at 105° C. The purity of the material Wl,l.8 found to be 98 percent by bromometric assay [7,8]. The original sample contained traces of sulfate and phenol, which were absent in the purified material.…”

Section: Methodsmentioning

confidence: 99%

“…where A and B are constants whose numerical values depend upon various natural constants, {3 is an empirical constant expressing in part the interactions of the nonpolar hydrogen and chloride ions with the polar phenolsulfonate ions [8,9,32] analogous to Kirkwood's treatment of ampholytes [20], al is the so-called closest distance of approach of the ions; and J.1. is the ionic strength of the mixtures.…”

Section: J Equals (E-eo)/(2 3026rt/f) + Log(mhmcl)mentioning

confidence: 99%

“…The fractional transformation, (x , of the indicator or buffer into bivalent ions, and the change in color,2 with increase in neutralization with alkali and corresponding rise in pH are represented byeq 1, , The p-phenolsulfonates and indicators give absorption index bands in the ultraviolet that are as different for acid ann alkaline solutions as are the visible bands for indicators. The molar absorption indices are used as a measure of the concentrations of the molecules and ions of these organic compounds [6,8,9]. The equations apply regardless of the number of uni-and bivalent electromers or electronic states giving the corresponding index bands [S, p. 220].…”

Section: Tautomeric Equilibria Of Phenol-sulfonic Acidsmentioning

confidence: 99%

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pH values of acid-salt mixtures of some aromatic sulfonic acids at various temperatures and a criterion of completeness of dissociation

Wj¹,

Gd²,

Sf³

1943

J. RES. NATL. BUR. STAN.

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A method is described to differentiate between completely and incompletely dissociated acids by means of measurements of the emf of galvanic cells without liquid junctions. Hydrogen and silver-silver-chloride electrodes and solutions of the acid, its sodium or potassium salt, and sodium or potassium chloride are used. The activity coefficients of hydrochloric acid in such mixtures are calculated by the equation relating the emf to the activity of hydrochloric acid in known concentrations of the acid and salts. If the mean values of the activity coefficient of hydrochloric acid in the mixtures are higher than those predicted by the limiting law of Debye and Hiickel, the acid is then considered to be completely dissociated. If they are lower, the acid is incomplet ely dissociated. By this method it was found that the sulfonic acid group in p-phenolsulfonic and 4-chlorophenol-2-sulfonic acids may be regarded as completely dissociated into sulfonate and hydrogen ions at temperatures of 10°, 25°, 40°, and 60° C.. Solutions containing p-phenolsulfonic acid, its sodium or potassium salt, and sodium or potassium chloride and solutions conta ining 4-chlorophenol-2-sulfonic acid, its sodium salt, and sodium chloride are s uitable for use as pH standards. Their pH values range from 1.2 to 2.5 and vary only slightly with temperature changes. Directions for their preparation a re given.The significa nce of t he complete dissociation of the sulfonic acid group in the calculation of the ioniza tion constants and pH values of sulfonate buffers and indicators is di scussed in t erms of the t automeric relations and the theory of color changes of indicat ors.

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Section: J Equals (E-eo)/(2 3026rt/f) + Log(mhmcl)supporting

confidence: 64%

Section: Tautomeric Equilibria Of Phenol-sulfonic Acidsmentioning

confidence: 53%

Section: Methodsmentioning

confidence: 99%

Section: J Equals (E-eo)/(2 3026rt/f) + Log(mhmcl)mentioning

confidence: 99%

Section: Tautomeric Equilibria Of Phenol-sulfonic Acidsmentioning

confidence: 99%

See 3 more Smart Citations

pH values of acid-salt mixtures of some aromatic sulfonic acids at various temperatures and a criterion of completeness of dissociation

Wj¹,

Gd²,

Sf³

1943

J. RES. NATL. BUR. STAN.

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Lichtabsorption von Lösungen im Ultraviolett und Sichtbaren

Pestemer¹,

Scheibe²,

Schöntag³

et al. 2013

Atom- Und Molekularphysik

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Influence of Polymer Conformation on the Shear Modulus and Morphology of Polyallylamine and Poly(α-l-lysine) Hydrogels

Oliveira¹,

Hirsch²,

Spontak³

et al. 2003

Macromolecules

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Two polyamines with different conformational properties, poly(α-l-lysine) and polyallylamine, were chemically cross-linked to evaluate the effects of polypeptide secondary structures on gel properties. Both cationic gels are highly swollen at low pH and shrink as it increases primarily due to the reduction in of the concentration of associated counterions in the gel as its ionization decreases. Network shear moduli were determined under uniaxial compression. For the polyallylamine gels, the shear modulus (G) scales as φ2 0.31, where φ2 denotes the polymer volume fraction, over the entire pH range. This result is in favorable agreement with the G ∼ φ2 1/3 relationship predicted for networks of flexible chains. Poly(α-l-lysine) gels swollen below pH 11.0 obey the same scaling behavior. At higher pH levels, however, organized secondary structures are believed to develop, and the composition dependence of the modulus at high pH becomes consistent with the scaling relationship predicted for rigid-rod chain networks connected by flexible junctions (G ∼ φ2 3/2). Further evidence of the existence of more organized microstructures in the poly(α-l-lysine) gels at high pH is provided from complementary thermoelasticity and morphological analyses.

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The assay of potassium p-phenolsulfonate, its pH range, and its ultraviolet absorption spectrum

Cited by 4 publications

References 0 publications

pH values of acid-salt mixtures of some aromatic sulfonic acids at various temperatures and a criterion of completeness of dissociation

pH values of acid-salt mixtures of some aromatic sulfonic acids at various temperatures and a criterion of completeness of dissociation

Lichtabsorption von Lösungen im Ultraviolett und Sichtbaren

Influence of Polymer Conformation on the Shear Modulus and Morphology of Polyallylamine and Poly(α-l-lysine) Hydrogels

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