Apparent Molal Volumes and Heat Capacities of some Sulfates and Carbonates in Water at 25 °C

1975 ◽  
Vol 53 (8) ◽  
pp. 1134-1138 ◽  
Author(s):  
Gérald Perron ◽  
Jacques E. Desnoyers ◽  
Frank J. Millero
Keyword(s):  
Heat Capacity ◽  
Ionic Strength ◽  
Ion Pair ◽  
Heat Capacities ◽  
Anomalous Increase ◽  
Low Concentration ◽  
Apparent Molal Volumes ◽  
Specific Heats ◽  
Molal Volumes ◽  
Apparent Molal Heat Capacities

The densities and volumetric specific heats of Na2SO4, K2SO4, MgSO4, Na2CO3, NaHCO3, and NaOH were measured up to an ionic strength of 1 in water at 25 °C with a flow densimeter and a flow microcalorimeter. From these data, the heat capacity for the formation of the ion pair MgSO40was evaluated as 84.9 J K−1 mol−1. There is an anomalous increase in the apparent molal heat capacities of Na2CO3 at low concentration but the apparent molal volumes are normal. This anomaly can be suppressed with NaOH. Attempts to account quantitatively for this behavior by an hydrolysis correction were not successful.

Aqueous solutions of azoniaspiroalkane halides. VI. Apparent molal volumes and apparent molal heat capacities of chlorides and iodides

1979 ◽  
Vol 8 (6) ◽  
pp. 449-460 ◽  
Author(s):  
Antonio Lo Surdo ◽  
Wen-Yang Wen ◽  
Carmel Jolicoeur
Keyword(s):  
Aqueous Solutions ◽  
Heat Capacities ◽  
Apparent Molal Volumes ◽  
Molal Volumes ◽  
Apparent Molal Heat Capacities

Apparent molal heat capacities and volumes of aqueous electrolytes at 25 °C: NaClO3, NaClO4, NaNO3, NaBrO3, NaIO3, KClO3, KBrO3, KIO3, NH4NO3, NH4Cl, and NH4ClO4

1978 ◽  
Vol 56 (1) ◽  
pp. 24-28 ◽  
Author(s):  
Alain Roux ◽  
Goolam M. Musbally ◽  
Gérald Perron ◽  
Jacques E. Desnoyers ◽  
Prem Paul Singh ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Infinite Dilution ◽  
Heat Capacities ◽  
Aqueous Electrolytes ◽  
Apparent Molal Volumes ◽  
Hückel Theory ◽  
Standard Values ◽  
Molal Volumes ◽  
Apparent Molal Heat Capacities

Measurements at 25 °C with flow calorimeters and densimeters have led to heat capacities and densities of aqueous solutions of 11 1:1 electrolytes: NaClO3, NaBrO3, NaIO3, NaNO3, NaClO4, NH4NO3, KClO3, KBrO3, KIO3, NH4Cl, and NH4ClO4. The first 6 salts were studied up to near saturation. We have used results of these measurements to obtain apparent molal heat capacities and apparent molal volumes of the various solutes. Extrapolation to infinite dilution on the basis of the Debye–Hückel theory bas led to [Formula: see text]and [Formula: see text] values for each solute. We have compared these standard values with results of earlier investigations.

Volumes and Heat Capacities of Cyclic Ethers and Amines in Water and of some Electrolytes in these Mixed Aqueous Solvents

1975 ◽  
Vol 53 (17) ◽  
pp. 2591-2597 ◽  
Author(s):  
Osamu Klyohara ◽  
Gérald Perron ◽  
Jacques E. Desnoyers
Keyword(s):  
Mixed Solvent ◽  
Transfer Functions ◽  
Heat Capacities ◽  
Cyclic Ethers ◽  
Apparent Molal Volumes ◽  
Cyclic Amines ◽  
Specific Heats ◽  
Molal Volumes ◽  
Mixed Aqueous Solvents ◽  
Structural Influence

The densities and volumetric specific heats of p-dioxane, tetrahydropyran, morpholine, piperidine, and piperazine were measured in water at 25 °C with a flow densimeter and a flow microcalorimeter. The same properties were also determined for LiCl, NaCl, Me4NBr, and Bu4NBr at 0.1 m in dioxane–water, morpholine–water, and piperidine–water mixtures. The derived apparent molal volumes and heat capacities of the nonelectrolytes in water and the transfer functions of the electrolytes from water to the mixed solvent suggest that all the present cyclic amines and ethers are hydrophobic; the overall structural influence is very small with dioxane and large with piperidine.

Apparent Molal Volumes and Heat Capacities of Urea and Methyl-Substituted Ureas in H2O and D2O at 25 °C

1974 ◽  
Vol 52 (9) ◽  
pp. 1709-1713 ◽  
Author(s):  
Patrick R. Philip ◽  
Gérald Perron ◽  
Jacques E. Desnoyers
Keyword(s):  
Heat Capacity ◽  
Hydrogen Bonding ◽  
Heat Capacities ◽  
Breaking Effect ◽  
Methyl Substitution ◽  
Apparent Molal Volumes ◽  
Hydrogen Bonding Interactions ◽  
Molal Volumes ◽  
Methylene Group ◽  
Structure Breaking

The apparent molal volumes and heat capacities of urea, 1,1- and 1,3-dimethylurea, and tetramethylurea were measured in H2O and D2O at 25 °C. From these data, urea–water interactions seem to cause an overall structure-breaking effect and the substituted ureas, an overall structure-making effect. The effect of the hydrogen-bonding interactions to the volume and heat capacity seems to be small compared with the intrinsic and hydrophobic contributions of a methylene group, as reflected by the isotope effect. Furthermore, transfer values seem to show a significant specificity to the degree and position of methyl substitution.

Apparent Molal Heat Capacities and Volumes of Tetrabutylammonium Carboxylates and Related Solutes in Water at 25 °C

1973 ◽  
Vol 51 (17) ◽  
pp. 2993-2998 ◽  
Author(s):  
Paul-André Leduc ◽  
Jacques E. Desnoyers
Keyword(s):  
Concentration Dependence ◽  
Sodium Acetate ◽  
Ammonium Acetate ◽  
Tetrabutylammonium Bromide ◽  
Heat Capacities ◽  
Ammonium Bromide ◽  
Sodium Octanoate ◽  
Apparent Molal Volumes ◽  
Molal Volumes ◽  
Apparent Molal Heat Capacities

The apparent molal volumes and heat capacities were measured in water at 25 °C with a flow digital densimeter and a flow microcalorimeter for the following salts: tetrabutylammonium octanoate, tetrabutylammonium butanoate, tetrabutylammonium bromide, ammonium acetate, ammonium chloride, ammonium bromide, sodium octanoate, and sodium acetate. The tetrabutylammonium octanoate and butanoate and sodium octanoate form micelles at 0.13, 0.6, and 0.35 M, respectively. The concentration dependence of the apparent molal volumes of the carboxylate salts is similar to that of typical hydrophobic or hydrophilic electrolytes. On the other hand, in the submicellar region, the concentration dependence of their apparent molal heat capacities is abnormal when compared with model electrolytes. It seems that the heat capacities may be reflecting interactions involving a hydrogen bonding of the carboxylate group with water.

Ultrasonic vibration potentials, apparent molal volumes, and apparent molal heat capacities of 1:1 electrolytes in acetonitrile

1979 ◽  
Vol 8 (10) ◽  
pp. 729-753 ◽  
Author(s):  
Raoul Zana ◽  
G�rald Perron ◽  
Jacques E. Desnoyers
Keyword(s):  
Ultrasonic Vibration ◽  
Heat Capacities ◽  
Apparent Molal Volumes ◽  
Molal Volumes ◽  
Apparent Molal Heat Capacities

Apparent Molal Volumes and Heat Capacities of Alkaline Earth Chlorides in Water at 25 °C

1974 ◽  
Vol 52 (22) ◽  
pp. 3738-3741 ◽  
Author(s):  
Gérald Perron ◽  
Jacques E. Desnoyers ◽  
Frank J. Millero
Keyword(s):  
Alkaline Earth ◽  
Heat Capacities ◽  
Apparent Molal Volumes ◽  
Flow Microcalorimeter ◽  
Specific Heats ◽  
Molal Volumes ◽  
Alkaline Earth Chlorides

The densities and volumetric specific heats of the alkaline earth chlorides have been measured in water at 25 °C in the concentration range 0.01 to 0.4 M with a flow densimeter and a flow microcalorimeter. Apparent molal volumes and heat capacities have been derived.

Aqueous solutions of azoniaspiroalkane halides. II. Apparent molal volumes and apparent molal heat capacities

1976 ◽  
Vol 80 (5) ◽  
pp. 466-470 ◽  
Author(s):  
Wen-Yang Wen ◽  
Antonio LoSurdo ◽  
Carmel Jolicoeur ◽  
Jeanine Boileau
Keyword(s):  
Aqueous Solutions ◽  
Heat Capacities ◽  
Apparent Molal Volumes ◽  
Molal Volumes ◽  
Apparent Molal Heat Capacities

The heat capacities and volumes of some low molecular weight amides, ketones, esters, and ethers in water over the whole solubility range

1978 ◽  
Vol 56 (22) ◽  
pp. 2808-2814 ◽  
Author(s):  
Geneviève Roux ◽  
Gérald Perron ◽  
Jacques E. Desnoyers
Keyword(s):  
Hydrophobic Interactions ◽  
Heat Capacities ◽  
Initial Slope ◽  
Pure Liquid ◽  
Factors Affecting ◽  
Solubility Range ◽  
Low Concentrations ◽  
Hydrophobic Solutes ◽  
Molal Volumes ◽  
Apparent Molal Heat Capacities

The densities and heat capacities per unit volume of aqueous solutions of propionamide, methylacetate, ethylacetate, methylethylketone and diethylketone, and bis(2-ethoxyethyl)ether were measured over the whole solubility range with a flow densimeter and a flow microcalorimeter. Most systems were studied at 10, 25, and 40 °C. Properties of the pure liquids were also measured whenever possible. The derived apparent molal volumes [Formula: see text] all decrease with concentration in the water-rich region, except with ethyl acetate which increases at high temperature. In general the more hydrophobic the solute the more negative the initial slope. All apparent molal heat capacities [Formula: see text] decrease as a function of concentration and the decrease is more important for more hydrophobic solutes. The apparent molal expansibilities [Formula: see text] are obtained from [Formula: see text]. They are positive for all solutes but, at low concentrations, they are smaller than the corresponding molar value of the pure liquid. Various factors affecting hydrophobic interactions are examined.

ChemInform Abstract: APPARENT MOLAL VOLUMES AND HEAT CAPACITIES OF ALKALINE EARTH CHLORIDES IN WATER AT 25 DEGREES

1975 ◽  
Vol 6 (7) ◽  
pp. no-no
Author(s):  
GERALD PERRON ◽  
JACQUES E. DESNOYERS ◽  
FRANK J. MILLERO
Keyword(s):  
Alkaline Earth ◽  
Heat Capacities ◽  
Apparent Molal Volumes ◽  
Molal Volumes ◽  
Alkaline Earth Chlorides
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