Partial Molar Volumes of Some Multicharged Electrolytes in Aqueous Dimethylformamide at Various Temperatures

1998 ◽  
Vol 63 (4) ◽  
pp. 507-514
Author(s):  
Madan L. Parmar ◽  
Ch. V. Nageshwara Rao ◽  
Suresh Chand Attri
Keyword(s):  
Partial Molar Volumes ◽  
Water Systems ◽  
Molar Volumes ◽  
Density Measurements ◽  
Solution Density ◽  
Aluminium Sulfate ◽  
Ion Interactions

Partial molar volumes of ammonium aluminium sulfate and potassium aluminium sulfate in DMF-water mixtures (5-20 wt.% of DMF) have been determined from solution density measurements at various temperatures and electrolyte concentrations. The data were evaluated by using Masson equation and the obtained parameters were interpreted in terms of ion-solvent and ion-ion interactions. Both electrolytes have been found to act as the structure makers/promotors in DMF-water systems.

The partial molar volumes of aqueous metal cations: their prediction and relation to volumes of activation for water exchange

1983 ◽  
Vol 61 (3) ◽  
pp. 473-480 ◽  
Author(s):  
Thomas W. Swaddle ◽  
Mark K. S. Mak
Keyword(s):  
Molar Volume ◽  
Coordination Number ◽  
Water Exchange ◽  
Partial Molar Volumes ◽  
Salt Solutions ◽  
Physical Origin ◽  
Molar Volumes ◽  
Density Measurements ◽  
Aqueous Ions ◽  
Perchlorate Salt

Partial molar volumes [Formula: see text] of the Fe2+, Ni2+, Fe3+, Cr3+, Rh3+, and M(NH3)5OH3+ (M = Cr, Co, Rh, Ir) aqueous ions have been obtained by extrapolation from density measurements at 298.15 K on the perchlorate salt solutions containing added HClO4 where necessary to suppress hydrolysis or oxidation. The values for these high-spin aqua-ions and others in the literature can be represented satisfactorily for ionic charges z = 1 through 4 by[Formula: see text]where [Formula: see text] is the absolute partial molar volume in cm3 mol−1 of Mz+(aq) relative to [Formula: see text] for H+(aq), and r is the Shannon radius in pm of Mz+ with coordination number nc. Volumes of activation ΔVex* for water exchange correlate inversely with [Formula: see text] within the series M2+(aq) and M(NH3)5OH23+(aq) at least, allowing predictions of ΔVex* to be made from [Formula: see text] or the above equation. The physical origin of these correlations is considered.

Electrostriction volumes of α-amino acids from density measurements in water and in aqueous HCl and NaOH solutions at 25 °C

1993 ◽  
Vol 71 (12) ◽  
pp. 2150-2154 ◽  
Author(s):  
M. Abbate ◽  
G. Castronuovo ◽  
V. Elia ◽  
S. Puzziello
Keyword(s):  
Amino Acids ◽  
Hydrochloric Acid ◽  
Aqueous Solutions ◽  
Sodium Hydroxide ◽  
Volume Change ◽  
Pure Water ◽  
Partial Molar Volumes ◽  
Molar Volumes ◽  
Density Measurements ◽  
Alkyl Chains

The values of the limiting partial molar volumes, [Formula: see text], for some α-amino acids bearing alkyl chains, in pure water and in aqueous solutions of hydrochloric acid and sodium hydroxide, have been obtained from density measurements. From these data it is possible to determine the volume change, ΔVZW, due to the formation of the amphionic molecule from the corresponding neutral molecule.

scholarly journals The partial molar volume of Fe2O3 in multicomponent silicate liquids and the pressure dependence of oxygen fugacity in magmas

1982 ◽  
Vol 45 (337) ◽  
pp. 237-245 ◽  
Author(s):  
X. Mo ◽  
I. S. E. Carmichael ◽  
M. Rivers ◽  
J. Stebbins
Keyword(s):  
Oxygen Fugacity ◽  
Pressure Dependence ◽  
Source Region ◽  
Partial Molar Volumes ◽  
Constant Composition ◽  
Molar Volumes ◽  
Density Measurements ◽  
Source Regions ◽  
Silicate Liquids ◽  
Image Position

AbstractDensity measurements of eight silicate liquids containing substantial amounts of Fe2O3 have been made over a range of 250 °C. These have been combined with published density measurements on multicomponent silicate liquids to yield (by multiple regression) partial molar volumes of SiO2, TiO2, Al2O3, Fe2O3, FeO, MgO, CaO, Na2O, and K2O. The data on Fe2O3-liquids are neither precise nor abundant enough to show a compositional dependence of . In a liquid of constant composition and temperature, the pressure dependence of the oxygen fugacity is given by which, if ΔV is independent of pressure, necessitates an increase in fO2 with increasing pressure of about 1 log10 unit for 10 kbars.Combining an equation relating oxygen fugacity to composition, T, and Fe2O3 at 1 bar (Sack et al., 1980) with the results for partial molar volumes, the oxygen fugacity of any magma can be calculated as a function of P and T. If basic magmas have their Fe2O3/FeO set in the source regions, and ascend isochemically, then the calculated oxygen fugacities in the mantle increase as pressure increases and silica activity decreases. A P-T grid has been constructed to show the calculated oxygen fugacities in a source region which has equilibrated with some common lava types, based on their FeO and Fe2O3 contents.

On the calculation of partial molar volumes at infinite dilution from experimental density data

2020 ◽  
pp. 1-7
Author(s):  
Jorge Álvarez Juliá ◽  
María Del Carmen Grande ◽  
Carmen Raquel Barrero ◽  
Carlos Miguel Marschoff
Keyword(s):  
Infinite Dilution ◽  
Partial Molar Volumes ◽  
Density Data ◽  
Molar Volumes ◽  
Experimental Density
Sign in / Sign up

Export Citation Format

Share Document