Using the mixed solvents, (water +ethanol + propanol), the solubility of CdF2 was determined byevaporating method at 25° C. The results showed that the sollbility, s, of CdF2 decreases bydecreasing the dielectric constant of the mixed solvent .Once the solubility of CdF2 was determined,the concentration solubility product, Ksp(c)=4s3, was calculated .Furthermore ,by estimating the meanactivity ...

The equil ibrium ratio of 3.93 for pSi(OH4~ p K +] was significantly different from the ratio of 3.40 predicted by the equation for the dissolution o f muscovite of this particular composit ion in the presence of gibbsite. A new dissolution equation was derived in which the muscovite composit ion was adjusted to satisfy the solute activity data, the presumption being that muscovite of a new com...

In this study, a series of interaction coefficients of the Brønsted-Guggenheim-Scatchard specific interaction theory (SIT) have been estimated up to 200 degrees C and 400 bars. The interaction coefficients involving Cl- estimated include epsilon(H+, Cl-), epsilon(Na+, Cl-), epsilon(Ag+, Cl-), epsilon(Na+, AgCl2 -), epsilon(Mg2+, Cl-), epsilon(Ca2+, Cl-), epsilon(Sr2+, Cl-), epsilon(Ba2+, Cl-), ...

The phenomenon of hydrogen absorption by metals, discovered about 100 years ago, nowadays demands some interest for technological reasons (hydrogen storage, fuel cells, hydrogen embrittle­ ment of construction materials). The palladium/hydrogen system claims for an exceptional position among the metal hydrides of the protonic type: because of its relative simplicity the Pd/H2-system serves as a...

Soil and stream water aluminium and hydrogen ion data are presented for three Scottish catchments that are both acidic and acid sensitive. Stream waters have pH values ranging from 3.9 to 7.1 and aluminium concentrations in the range 0.07 to 129 MM l". Within the soils H concentrations decline with depth, being highest in the organic horizons and lowest in the inorganic horizons. Mean EF concen...

thermodynamic restrictions and simultaneous effects of operational conditions on the homogeneous rhodium-catalyzed carbonylation of methanol are studied in this line of research. it is shown that the general nrtl-virial model can be appropriated to study thermodynamics of the carbonylation. it is obtained that the reaction is kinetically and thermodynamically reasonable at temperatures above 42...

this paper investigates the kinetics of structure h (sh) formation kinetics above and below the structure i (si) formation equilibrium curve at temperatures of between 2â°c and 6â°c. methane was used as a help gas and methylcyclohexane (mch) was used as sh former. it was concluded that in the points above the si formation equilibrium curve, at the first, the si forms, and then converts to sh be...

In this paper, the solubility of NaCl in water is evaluated by using computer simulations for three different force fields. The condition of chemical equilibrium (i.e., equal chemical potential of the salt in the solid and in the solution) is obtained at room temperature and pressure to determine the solubility of the salt. We used the same methodology that was described in our previous work [E...

In isolated bimetallic nanoscale systems the limit amount of matter and surface-induced size effects can change the thermodynamics of first-order phase transformation. In this paper we present theoretical modification of Gibbs free energy concept describing first-order phase transformation of binary alloyed nanoparticles taking into account size effects as well as depletion and hysteresis effec...