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1.
Lajos Szirovicza 《Reaction Kinetics and Catalysis Letters》2009,96(2):311-317
The kinetics of the reactions of ClO3
− with HSO3
− and H2SO3 was studied by measuring the concentration of [Cl−] and [H+] both in chlorate-bisulfite and chlorate-sulfite/bisulfite solutions. A reaction mechanism was applied for simulation of
the experimental observations. Rate constants k1 = (1±0.5)·10−4 M−1 s−1 and k2 = (0.23±0.01) M−1 s−1 were determined for the following reactions:
Rate constant k1 was obtained directly from the experimental results of chloratesulfite/ bisulfite reactions, where reaction (1) is predominant.
Rate constant k2 was obtained by computer fitting of [Cl−] and [H+] to the experimental values both in chlorate-bisulfite and chlorate-sulfite/bisulfite reactions. 相似文献
((1)) |
((2)) |
2.
C Paz-Ramos C A Cerdeiriña J Troncoso L Romaní 《Journal of Thermal Analysis and Calorimetry》2006,83(2):263-268
In the search of a useful
method for determining excess enthalpies as a function of temperature Calvet
calorimetry was employed. To this end, excess molar enthalpies
at 298.15 and 333.15 K and excess molar heat capacities
within 283.15–333.15 K were
determined for the 1-decanol+n-decane system
over the whole composition range. An isothermal flow Calvet-type calorimeter
was used for
measurements, whereas
were determined by means of a Setaram
Micro DSC calorimeter. Excess enthalpies within 283.15–333.15 K were
indirectly obtained through the integration of
(T) data using
at 298.15 K. The results obtained at 333.15 K agreed with those
determined directly, implying the thermodynamic consistency of the measured
data and, therefore, the reliability of the indirect method. 相似文献
3.
Leopoldo Ceraulo Serena Fanara Angela Ruggirello Vincenzo Turco Liveri 《Journal of Cluster Science》2007,18(4):883-895
The state of the water-soluble salt iron(III) chloride in AOT reverse micelles dispersed in carbon tetrachloride has been
investigated by FT-IR spectroscopy. Interestingly, while the entrapment of a lot of water-soluble inorganic salts in AOT reverse
micelles requires preliminarily the presence of significant amounts of water within the micellar core, solubilization of FeCl3 occurs without the need to add water in the micellar solution reaching the very high solubility value, expressed as the maximum
salt-to-surfactant molar ratio, of 1.30. The analysis of the spectral features of the investigated samples leads to hypothesize
that iron(III) chloride is confined within the reverse micellar core as small size melted clusters of ionic species arising
from the reactions
accompanied by a marked structural rearrangement of the AOT head group domain surrounding the micellar core and a shift of
the sodium counterion from the micellar core surface to its interior. This picture has been further corroborated by conductivity
measurements of FeCl3/AOT/CCl4 solutions as a function of the salt-to-surfactant molar ratio. 相似文献
4.
The solubility of rhodochrosite (MnCO3) at 25°C under constant carbon dioxide partial pressure p(CO2) was determined in NaCl solutions as a function of ionic strength I. The dissolution of MnCO3(s) for the reaction
has been determined as a function of pH. From these values, we have determined the equilibrium constant for the stoichiometric solubility of MnCO3(s) in NaCl solutions
These values have been fitted to the equation
with a standard error of = 0.1 with Iand concentrations in molalities. The extrapolated value of log K
o
sp(–10.3) in water is in good agreement with literature data (–10.1 to 10.8) determined in solutions of different composition and ionic strength. The measured values of the activity coefficient, T(Mn2+) and T(CO3
2–), have been used to estimate the stability constant for the formation of the MnCO3ion pair, K
*(MnCO3
0). The value of K
0(MnCO3
0) calculated from the values of K
*(MnCO3) by the Pitzer equation ( = 0.1) in this study (4.8 ± 0.1) is in reasonable agreement with literature data. 相似文献
5.
The solubility of siderite (FeCO3) at 25°C under constant CO2 partial pressure [p(CO2)] was determined in NaCl solutions as a function of ionic strength. The dissolution of FeCO3(s) for the reaction
has been determined as a function of pH = – log[H+]. From these values we have determined the equilibrium constant for the stoichiometric solubility to FeCO3(s) in NaCl
These values have been fitted to the equation
with a standard error of s = 0.15. The extrapolated value of log(K
o
sp) – 10.9 in water is in good agreement with data in the literature (– 10.8 to – 11.2) determined in solutions of different composition and ionic strength.The measured values of the activity coefficient, T(Fe2+) T(CO3
2–), have been used to estimate the stability constant for the formation of the FeCO3 ion pair, K*(FeCO3). The values of K*(FeCO3) have been fitted to the equation (s = 0.09)
The value of log[K
o(FeCO3)] in water found in this study (6.3 ± 0.2) is slightly higher than the value found from extrapolations in 1.0 m NaClO4 solutions (5.9 ± 0.2). These differences are related to the model used to determine the activity coefficients of the Fe(II) and carbonate species in the two solutions. 相似文献
6.
From stopped-flow spectrophotometric studies on the kinetics of dissociation of [M(trien)]2+ (M=CuII, NiII) to M
aq
2+
and trien H
4
4+
in aqueous acid medium, it has been established that the reaction occurs in a complex manner conforming to the relation
相似文献
7.
The Gibbs free energies of formation of Eu3RuO7(s) and Eu2Ru2O7(s) have been determined using solid-state electrochemical technique employing oxide ion conducting electrolyte. The reversible electromotive force (e.m.f.) of the following solid-state electrochemical cells have been measured:
8.
H. R. Galleguillos-Castro F. Hernández-Luis L. Fernández-Mérida M.A. Esteso 《Journal of solution chemistry》1999,28(6):791-807
Activity coefficients for sodium chloride in the NaCl + Na2SO4 + H2O ternary system were determined from emf measurements of the cell
9.
The osmium(VIII) catalysed IO4
− oxidation of DMF in aqueous alkaline medium follows the rate law:
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