Counterion Binding in Aqueous Solutions of Poly(vinylpyridines) as Assessed by Potentiometric Titration

The dissociation of L-serine orthophosphate (H3L) and its complexation reactions with calcium(II) and magnesium(II) have been studied by potentiometric titration at 37 °C in the 0.15 mol l−1 potassium nitrate medium and (with the exception of calcium(II) complexation) in the 0.15 mol l−1 tetraethylammonium bromide medium. A least squares interpretation of the data has yielded dissociation constants for H3L and equilibrium constants for the formation of the 1:1 metal–ion complexes MH2L+, MHL, and ML−. In addition the dimeric species H5L2−, MH3L2−, and M2H2L2 are consistent with the data and equilibrium constants for their formation have been determined.

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Potentiometric titration for determining the composition and stability of metal(II) alginates and pectinates in aqueous solutions

Russian Journal of Physical Chemistry A ◽

10.1134/s0036024415070146 ◽

2015 ◽

Vol 89 (7) ◽

pp. 1216-1222 ◽

Cited By ~ 2

Author(s):

N. Sh. Kaisheva ◽

A. Sh. Kaishev

Keyword(s):

Aqueous Solutions ◽

Potentiometric Titration

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An Influence of the Spatial Arrangement, Length of the Alkyl Chain and Temperature on Micellar Properties of N-Alkyl-N-{[2-(benzyloxy)cyclohexylmethyl]}-N,N-dimethylammonium Bromides in Aqueous Solutions

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19971853 ◽

1997 ◽

Vol 62 (12) ◽

pp. 1853-1862 ◽

Cited By ~ 2

Author(s):

Jarmila Oremusová ◽

Veronika Mislovičová

Keyword(s):

Aqueous Solutions ◽

Alkyl Chain ◽

Spatial Arrangement ◽

Critical Micellar Concentration ◽

Small Decrease ◽

Counterion Binding ◽

Micellar Properties ◽

Fold Reduction ◽

Increasing Temperature ◽

Methylene Group

In this work we study influence of the length of the alkyl chain and temperature on critical micellar concentration (CMC) for cis and trans diastereoisomers of the N-alkyl-N-{[2-(benzyloxy)cyclohexylmethyl]}-N,N-dimethylammonium bromides in aqueous solutions using conductometric and spectrophotometric techniques. From the measured dependences, the degree of the counterion binding (β) and thermodynamic parameters of micellization (∆Gm0, ∆Hm0, ∆Sm0) were calculated and compared with the literature data on similar compounds. The results show that lengthening of the alkyl chain by one methylene group causes approximately a two-fold reduction in CMC. The β values decrease with temperature and with increasing length of the alkyl chain. While only a small decrease in the ∆Gm0 values (ca 1 kJ mol-1) due to increasing temperature was found, the decrease in ∆Hm0 is much more pronounced.

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The Solubility of Amorphous and Crystalline Schoepite in Neutral to Alkaline Aqueous Solutions

MRS Proceedings ◽

10.1557/proc-127-871 ◽

1988 ◽

Vol 127 ◽

Cited By ~ 15

Author(s):

Jordi Bruno ◽

Amaia Sandino

Keyword(s):

Aqueous Solutions ◽

Potentiometric Titration ◽

Solubility Product ◽

Formation Constants ◽

Spent Fuel ◽

Dissolution Studies ◽

Ph Range

ABSTRACTThe solubility of schoepite, UO2(OH)2 H2O, has been investigated by potentiometric titration at 25 °C in 0.5 mol dm.−3 NaClO4 solution. The data indicates the predominance of the species (UO2)3(OH)5+ and either UO2(OH)3− or (UO2)3(OH)7− in the pH range studied. The formation constants of these species as well as the solubility product of the amorphous and microcrystalline schoepite have been determined. The consequences of these data on the hypothesis of schoepite as the solubility limiting phase in spent fuel dissolution studies is discussed.

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