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- W1569596733 abstract "Hydrogen ion titrations were carried out on sonicated dispersions of phosphatidic acid, at several concentrations of added NaCl. A strong dependence of pKa on the degree of dissociation, α, was found. The experimental results were compared with the results of computations using the nonlinearized Poisson-Boltzmann equation, which was numerically solved for the case of hollow spherical vesicles. It was found that the experimental slope of ΔpK vs α was significantly greater than that obtained theoretically, at all salt concentrations. The difference was greater than could be attributed to any simple experimental or theoretical error. The change in pK as a function of salt concentration was also studied. In the range of 0.01 to 0.1 M salt, theory and experiment both gave ΔpK/Δ(log salt molarity) ≈ −1.0. This same slope was found to extend down to 10−4 or 10−5M salt by the theoretical methods, but experimentally the increment in pK was much smaller upon going from 0.01 to 0.001 M NaCl. Titration data on additional vesicular systems are required before it is possible to conclude whether these experimental-theoretical disagreements are due to a fundamental error in the theoretical model, or whether they came from an unrecognized peculiarity of the phosphatidic acid system." @default.
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- W1569596733 date "1977-10-01" @default.
- W1569596733 modified "2023-09-27" @default.
- W1569596733 title "Electrochemical properties of spherical polyelectrolytes" @default.
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- W1569596733 doi "https://doi.org/10.1016/0021-9797(77)90465-9" @default.
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