Apparent molar volumes for dilute solutions of NaClO4 and [Co(en)3] (ClO4)3 in D2O and H2O at 278-318 K

1981 ◽  
Vol 34 (12) ◽  
pp. 2487 ◽  
Author(s):  
GA Bottomley ◽  
LG Glossop
Keyword(s):  
Dielectric Constant ◽  
Temperature Dependence ◽  
Isotope Effect ◽  
Ion Pairing ◽  
Solvent System ◽  
Apparent Molar Volumes ◽  
Dilute Solutions ◽  
Molar Volumes

Apparent molar volumes for dilute solutions of NaClO4 and [Co(en)3] (ClO4)3 in D2O and H2O were measured by using a dilatometry technique at 278, 298 and 318 K. Comparison of limiting slopes with the Debye-Huckel predictions from the dielectric constant and compressibility of H2O and D2O is complicated by ion pairing. The apparent molar volumes for NaClO4 were less in D2O than in H2O. The complex [Co(en)3] (ClO4)3 when studied in D2O had its amine protons exchanged by deuterium; this did not allow a direct comparison of the apparent molar volumes of the protonated complex in each solvent system, but revealed a large isotope effect. The apparent molar volumes of the [Co(en)3] (ClO4)3 showed a much larger temperature dependence than that of NaClO4.

scholarly journals Density and Viscosity of LiCl, LiBr, LiI and Kcl in Aqueous Methanol at 313.15K

2021 ◽  
Vol 37 (5) ◽  
pp. 1083-1090
Author(s):  
V. V. Kadam ◽  
A. B. Nikumbh ◽  
T. B. Pawar ◽  
V. A. Adole
Keyword(s):  
Experimental Data ◽  
Dielectric Constant ◽  
Apparent Molar Volumes ◽  
Strong Electrolyte ◽  
Aqueous Methanol ◽  
Molar Volumes ◽  
Solvent Interactions ◽  
Viscosity Coefficients ◽  
Physicochemical Processes ◽  
Increase With Increase

The densities and viscosities of electrolytes are essential to understand many physicochemical processes that are taking place in the solution. In the present research, the densities and viscosities of lithium halides, LiX (X = Cl, Br, I ) and KCl in (0, 20, 40, 50, 60, 80 and 100) mass % of methanol + water at 313.15K were calculated employing experimental densities (ρ), the apparent molar volumes( ϕv) and limiting apparent molar volumes (0v) of the electrolytes. The (0v) of electrolyte offer insights into solute-solution interactions. In terms of the Jones-Dole equation for strong electrolyte solution, the experimental data of viscosity were explored. Viscosity coefficients A and B have been interpreted and discussed. The B-coefficient values in these systems increase with increase of methanol in the solvents mixtures. This implied that when the dielectric constant of the solvent decreases, so do the solvent-solvent interactions in these systems.

Molar volumes and refractivities of highly concentrated solutions of ammonium and potassium thiocyanates in water and dimethylsulphoxide

1988 ◽  
Vol 66 (9) ◽  
pp. 2244-2249 ◽  
Author(s):  
Petr Pacák ◽  
Zdenĕk Kodejš
Keyword(s):  
Composition Range ◽  
Apparent Molar Volumes ◽  
Refractive Indices ◽  
Dilute Solutions ◽  
Concentrated Solutions ◽  
Lorenz Equation ◽  
Molar Volumes ◽  
Solvent Interactions ◽  
Density Measurements ◽  
Concentration Dependences

Densities and refractive indices of highly concentrated solutions of ammonium and potassium thiocyanates in water and dimethylsulphoxide have been measured at 333.2 K in the composition range from xs = 0.01 up to saturated solutions. Molar volumes and apparent molar volumes have been calculated from density measurements and their concentration dependences are discussed. All the systems are volumetrically non-ideal and exhibit negative deviations from additivity. The molar refractivities were calculated from the refractive indices using the Lorentz–Lorenz equation. The refractivity values of individual ions were estimated in infinitely dilute solutions and were used for discussion of ion–solvent interactions.

Temperature dependence of apparent molar volumes of electrolytes related to water compressibility

1981 ◽  
Vol 34 (9) ◽  
pp. 1989
Author(s):  
GA Bottomley ◽  
LG Glossop
Keyword(s):  
Temperature Dependence ◽  
Linear Function ◽  
Apparent Molar Volumes ◽  
Molar Volumes ◽  
Volumes Of Electrolytes

Ellis's published information on the limiting apparent molar volumes of 17 electrolytes in water is here shown in most cases to be a closely linear function of the solvent's isothermal compressibilityfrom 75°C to 200�C, with different slopes for the 1 : 1 and 2 : 1 electrolytes.

Dilatometer Studies of the Apparent Molar Volume Limiting Law for High-Charge Electrolytes

1979 ◽  
Vol 32 (4) ◽  
pp. 699 ◽  
Author(s):  
GA Bottomley ◽  
LG Glossop ◽  
WP Staunton
Keyword(s):  
Molar Volume ◽  
Apparent Molar Volume ◽  
Ion Pairing ◽  
Apparent Molar Volumes ◽  
Aqueous Electrolytes ◽  
Disturbing Factor ◽  
Molar Volumes ◽  
High Charge ◽  
Low Concentrations

A continuous-dilution dilatometer, of the tilting type, specifically designed for study of the apparent molar volumes of aqueous electrolytes at low concentrations, is described. Results at 298.16 K have been secured for multivalent (� 3, � 4, � 6) univalent electrolytes which demonstrate that the apparent molar volumes vary with c� in approximate conformity with the Debye-Huckel limiting-law slopes. Data are presented for: [Co(en)3] Cl3, K3 [CO(CN)6], [Pt(en)3] Cl4, K4 [Mo(CN)8], [C0{(0H)2Co(en)2}3] (NO3)6,Na6C6(C00)6, K4 [Fe(CN)6] and [Co(en)3] (C1O4)3 Ion pairing is a significant disturbing factor which hinders treatment of the data in terms of extended forms of the Debye-Huckel equation.

The trifluoroacetic acid solvent system. Part VI. Density measurements

1980 ◽  
Vol 58 (3) ◽  
pp. 283-286 ◽  
Author(s):  
John B. Milne
Keyword(s):  
Trifluoroacetic Acid ◽  
Dissociation Constants ◽  
Ion Pairs ◽  
Solvent System ◽  
Apparent Molar Volumes ◽  
Equivalent Conductivity ◽  
Molar Volumes ◽  
Density Measurements ◽  
System Part ◽  
Triple Ions

The densities of solutions of several 1:1 trifluoroacetate electrolytes have been measured in 100% trifluoroacetic acid (HOTFA) and apparent molar volumes for their ion pairs have been determined. The density measurements coupled with limiting equivalent conductivities and dissociation constants, calculated by means of the Fuoss–Hsia equation, permit a more precise treatment of the conductivities of solutions at concentrations where the equivalent conductivity minimum occurs. The existence of triple ions in this solvent is not required to account for the conductivity minimum.

scholarly journals The temperature dependence of the mobility of aqueous fluoride ion, and the apparent molar volume of sodium fluoride

1977 ◽  
Vol 30 (6) ◽  
pp. 1375 ◽  
Author(s):  
T Mallanoo ◽  
RH Stokes
Keyword(s):  
Temperature Dependence ◽  
Molar Volume ◽  
Sodium Fluoride ◽  
Apparent Molar Volume ◽  
Apparent Molar Volumes ◽  
Fluoride Ion ◽  
Molar Volumes ◽  
Aqueous Sodium

Conductances of aqueous sodium fluoride solutions have been measured at 15�, 25� and 45�C to give the limiting mobility of fluoride ion. Apparent molar volumes have been obtained by means of a continuous dilution dilatometer.

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