CXVII.—The activity of hydrogen-ion in aqueous solutions of hydrogen fluoride

The variation of the experimental extraction coefficient for protactinium upon dilution of the solvent ketone with benzene has been determined for aqueous solutions at constant concentration of hydrochloric acid. The bromo complex has been shown to be far less readily extracted. The effects on the extraction of the nitrate complex by amyl acetate, of the nitric acid, of the nitrate and hydrogen ion concentrations in the aqueous phase, as well as of the dilution of the solvent with benzene, have been explored. The existence of a slow reaction in the extraction has been demonstrated. It is concluded that chloride solutions are the more reliable for the isolation of protactinium from concentrates.

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THE ELIMINATION OF DISCREPANCIES BETWEEN OBSERVED AND CALCULATED P.D. OF PROTEIN SOLUTIONS NEAR THE ISOELECTRIC POINT WITH THE AID OF BUFFER SOLUTIONS

The Journal of General Physiology ◽

10.1085/jgp.4.5.617 ◽

1922 ◽

Vol 4 (5) ◽

pp. 617-619 ◽

Cited By ~ 1

Author(s):

Jacques Loeb

Keyword(s):

Aqueous Solution ◽

Aqueous Solutions ◽

Isoelectric Point ◽

Hydrogen Ion ◽

Ion Concentration ◽

Protein Solutions ◽

Protein Solution ◽

Hydrogen Ion Concentration ◽

Buffer Salt ◽

Buffer Solutions

1. It had been noticed in the previous experiments on the influence of the hydrogen ion concentration on the P.D. between protein solutions inside a collodion bag and aqueous solutions free from protein that the agreement between the observed values and the values calculated on the basis of Donnan's theory was not satisfactory near the isoelectric point of the protein solution. It was suspected that this was due to the uncertainty in the measurements of the pH of the outside aqueous solution near the isoelectric point. This turned out to be correct, since it is shown in this paper that the discrepancy disappears when both the inside and outside solutions contain a buffer salt. 2. This removes the last discrepancy between the observed P.D. and the P. D. calculated on the basis of Donnan's theory of P.D. between membrane equilibria, so that we can state that the P.D. between protein solutions inside collodion bags and outside aqueous solutions free from protein can be calculated from differences in the hydrogen ion concentration on the opposite sides of the membrane, in agreement with Donnan's formula.

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Spectrophotometric investigations of the reaction between gold(III) and potassium iodide

Journal of the Serbian Chemical Society ◽

10.2298/jsc0006345v ◽

2000 ◽

Vol 65 (5-6) ◽

pp. 345-352 ◽

Cited By ~ 4

Author(s):

Vesna Vasic ◽

Suzana Premovic ◽

Mira Cakar ◽

Bojan Radak ◽

Gordana Milovanovic

Keyword(s):

Complex Formation ◽

Aqueous Solutions ◽

Absorption Spectra ◽

Potassium Iodide ◽

Equilibrium Constants ◽

Hydrogen Ion

The equilibria of the complex formation between AuCl4-n(OH)n - and I- was studied spectrophotometrically in aqueous solutions containing KI:Au(III)?2 in the acidity range from 1 M HCl to pH 7 at 25?C. From the hydrogen ion and Cl-ion dependence of the absorption spectra, it was found that AuCl2I2 - and Au(OH)2I2 - complexes were formed. The equilibrium constants of complex formation were determined.

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