heat capacities of concentrated aqueous solutions of sodium

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Heat Capacities of Concentrated Aqueous Solutions of Sodium ...

Heat capacities of aqueous solutions of Na2SO4 and Na2CO3 up to near saturation (1.9 and 2.5 mol·kg-1, respectively) and of NaOH (to 7 mol·kg-1) have been measured at 25 °C with a Picker flow calorimeter. The calorimeter performance was checked using concentrated NaCl(aq) solutions. On the basis of these...

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Heat Capacities of Concentrated Aqueous Solutions of Sodium ...

Apr 19, 2002 ... Heat capacities of aqueous solutions of Na2SO4 and Na2CO3 up to near saturation (1.9 and 2.5 mol·kg-1, respectively) and of NaOH (to 7 mol·kg-1) have been measured at 25 °C with a Picker flow calorimeter. The calorimeter performance was checked using concentrated NaCl(aq) solutions. On the basis...

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Heat Capacities of Concentrated Aqueous Solutions of Sodium ...

Dec 19, 2017 ... Heat capacities of aqueous solutions of Na2SO4 and Na2CO3 up to near saturation (1.9 and 2.5 mol·kg-1, respectively) and of NaOH (to 7 mol·kg-1) have been measured at 25 °C with a Picker flow calorimeter. The calorimeter performance was checked using concentrated NaCl(aq) solutions. On the basis...

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Heat capacities in some aqueous solutions - Nvlpubs.nist.gov…

and sodium citrate are given in tabular and graphic form. The importance of the results in interpreting the behavior of ions and molecules in aqueous solution .... of the solute at any given concentration and in determining the difference between the heat capacity of H2 in the given solution and the heat capacity of pure H20.

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Standard state heat capacities of aqueous ... - NRC Research Press

partial molar heat capacities and their applications to calculations of the effects of temperature on equilibrium constants, electrode ... Key words: heat capacities, electrolytes; aqueous solutions, heat capacities; thermodynamics, electrolytes. RCsumC ..... state partiaf molar heat capacity of aqueous sodium chloride and the...

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Heat capacities of aqueous electrolytes - NRC Research Press

CAN. 1. CKEM. VOL. 54. 1976. TABLE 1. Apparent molal heat capacities of aqueous electrolytes at 298 K*. Number of. 4c O. Concentration concentrations. Solute. (9 K-I mol-1) ..... Solutions of Sodium Sulfate, Sodium Carbonate, and Sodium Hydroxide at 25 °C. Journal of Chemical & Engineering Data 47:3,. 590. [Crossref].

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Apparent molal heat capacities and volumes of aqueous hydrogen ...

of k0.47 at 300°C. The heat capacity data for bulk aqueous NazS suggest that the relative concentration of SZ- at these molalities is .... Solutions of. NaHS were also prepared from well defined crystals, synthe- sized in ethanol by reacting H,S with sodium ethoxide using the method of Stephens and Cobble (1 1). The crystals...

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Apparent molar heat capacities of aqueous solutions of acetic ...

The apparent molar heat capacities of dilute aqueous solutions of acetic, propa- noic and succinic acid and sodium salts of the two monofunctional acids were measured at 300 K < T < 525 K and p = 28 MPa. Corrections for ionization/ hydrolysis and relaxation effects were applied and the results were extrapolated to infinite...

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Physicothermal Properties of Aqueous Sodium Chloride Solutions ...

Nov 2, 2014 ... Physicothermal properties of sodium chloride solutions as complementary information to the existent in literature were experimentally measured under ... Density, dynamic viscosity, specific heat capacity and thermal conductivity were measured using a standard volumetric glass pycnometer, rheometer,...

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Polymer–surfactant interactions: Thermodynamics of some ...

Interactions between poly(propylene) glycols and sodium dodecylsulfate, in aqueous solutions were investigated through thermodynamic analysis. Densities and heat capacities, measured with the corresponding well-known Picker apparatus, were determined as a function of the surfactant concentration at 298.15 K. The...

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Lithium and Calcium Chlorides - M. Conde Engineering

Thermal conductivity,. – Specific thermal capacity,. – Differential enthalpy of dilution, and. – Diffusion coefficient of water into aqueous solutions. Furthermore, Othmer and Dühring diagrams and a diagram giving ..... We found that αR shows a linear dependence upon concentration, for solutions of both lithium and calcium.

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A compilation of thermodynamic and transport properties of aqueous ...

Measured the dissociation of the bisulphate ion over a concentration ranqe of. 0.010 to ... Determined the vapor pressures of aqueous sulfuric acid. - solutions at25C. Thirteen values of the osmotic coefficient have been calculated from these data. The ..... "The Heat of Solution of Halides, Sulphuric Acid, Oxalic Acid, Sodium.

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Erich Koenigsberger | Profile | Murdoch University in Perth Australia

Magalhaes, C., Koenigsberger, E., May, P., Hefter, G., (2002), Heat Capacities of Concentrated Aqueous Solutions of Sodium Sulfate, Sodium Carbonate, and Sodium Hydroxide at 25 degrees C, Journal of Chemical & Engineering Data, 47, , pages 590 - 598. Koenigsberger, L., Koenigsberger, E., May, P., Hefter, G., (2000),...

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Thermophysical Properties of Sodium Nitrate and ... - OSTI.GOV

Thermophysical properties of sodium chloride (NaCl) solutions have been better understood than those of ... density, viscosity, solubility and vapor pressure of NaNO3 solutions on salt concentration and temperature ... performed using different values of thermal conductivity, permeability, and temperature, in order to (1)...

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Densities of aqueous MgCl2(aq), CaCl2(aq), KI(aq), NaCl(aq), KCl ...

Saluja, P. P. S.; LeBlanc, J. C., Apparent molar heat capacities and volumes of aqueous solutions of magnesium chloride, calcium chloride, and strontium chloride at elevated temperatures. J. Chem. Eng. Data 1987, 32, (1), 72-76. 11. Kumar, A., Densities and apparent molal volumes of aqueous concentrated calcium...

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How does salt change the specific heat capacity of water? | Socratic

Oct 26, 2016 ... The added heat cannot go into increasing the energy of these motions, so it goes into increasing the energies of the other water molecules in the solution. It takes less energy to activate these molecules, so the specific heat of the water decreases. The greater the concentration of NaCl, the lower the specific...

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SCH4U: Calorimetry

The changes in temperature caused by a reaction, combined with the values of the specific heat and the mass of the reacting system, makes it possible to determine the heat ... The density of water is 1.00 g/mL and even though these are solutions we can assume that they are close enough to water to have the same density.

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Calorimetric studies of macromolecular aqueous solutions - CiteSeerX

organisation, the dependence of the differential isobaric heat capacity on temperature forms, in the textbook case, a .... In our recent research we have concentrated attention on vesicles formed by dialkylphosphates in aqueous solution. The pattern is set by vesicles formed by sodium di-n-dodecylphosphates. For these.

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ANTIMONY (III) AND ANTIMONY (V) SOLIDS IN BASIC AQUEOUS ...

Dec 2, 1999 ... concentration en phase aqueuse. ... 'Reactor Chemistry Branch moldrn-3 in any neutral or basic aqueous solutions (assuming no added sodium salts). Therefore, under HTS conditions, precipitation of any antimony oxides ..... Table A5: Literature Tabulations of Heat Capacity Values for Antimony Oxides at.

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Persulfates - PeroxyChem

Concentration (g/L). Ammonium Persulfate. Potassium Persulfate. Sodium Persulfate. Solubilities of Persulfate Salts. Maximum solubility of persulfate salts in water ... Heat Capacity (cal/g. °C). Ammonium Persulfate. Potassium Persulfate. Sodium Persulfate. 1.1. 1.0. 0.9. 0.8. 0.7. 0.6. 0.5. Heat Capacity of Aqueous Solutions.

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Solvay Chemicals Liquid Caustic Soda (NaOH in water, up to 50%)

Some applications of this product may be regulated or restricted by national or international standards (e.g. for food additives, water treatment, the pharmaceutical industry, etc). The buyer and the eventual user, in his sole and entire.

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Thermodynamic properties of selected uranium compounds and ...

Heat capacities of rutherfordine and dehydrated schoepite by differential scanning calorimetry . ... The molar concentration of aqueous aluminum or uranyl solution species (M) as a function of pH ........ 32. 3. ... uranium-bearing phases and 28 aqueous uranium solution species (298.15 K and 1 bar) are tabulated based upon.

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Solubility and Prediction of the Heat of Solution of Sodium Naproxen ...

The solubility of sodium naproxen was determined over a range of temperatures from 15.2°C to 39.7°C by two methods: analyses of samples from equilibrated solutions and a recently developed procedure utilizing a focused-beam reflectance method (FBRM). The results demonstrate the utility of the newer and, in some...

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Density and viscosity of brine - GFZpublic

May 26, 2010 ... Keywords: density, viscosity, brine, aqueous sodium chloride solution, geothermal energy, pressure profile, pumping requirements. 1. Introduction. 1. Geothermal heat and power plants use hot geothermal fluid as a transport. 2 medium to extract .... and heat capacities of the phases. The basic idea is that...

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An Improved Method for Determining Specific Heats of Liquids, with ...

two successive distillations and this sample, one-ninth of the material at first employed, was diluted with freshly distilled water to the de sired concentration. Two samples .... For example, the specific heat of a solution of sodium hydroxide with. 100 mois of ... hydroxide in hot aqueous solution. x4iter the settling of the precipi.

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Thermophysical Properties - Cabot Corporation

A7.4 Specific heat capacity . .... heat capacity ρ. = fluid density μ. = fluid viscosity ν. = fluid velocity. C, m, n = correlation parameters. When comparing the properties of two fluids, higher heat transfer .... lower density range, blends of concentrated sodium and potassium formate in the medium density range, and blends of.

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Determination of the Specific Heat Capacities of Aqueous Solutions ...

Thermodyn., 13, 89 (1981)) was used for measurements of the specific heat capacities of aqueous solutions of D -xylose, D -ribose, D -, and L -arabinose at ca. 30 °C. The ... Dependence of φCp upon solute concentration varied markedly with the solvent composition but the variation was similar for both solutes. The infinite...

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Neutron Diffraction Study of Aqueous Ionic Solutions. II. Aqueous ...

The structure factors Sm(Q) for aqueous solutions of NaCl and KCl at room temperature have been determined by means of the LINAC-TOF-neutron diffraction method. A revised subtraction method was applied to diffraction data of the solutions. Results obtained for the structure of the nearest hydration shell around ions are...

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Thermophysical Properties of Aqueous Solutions Used ... - DiVA portal

2. Figure 1.1 Completely indirect system. Research has the last decade been made with aqueous solutions as ... The additive concentration of the secondary working fluid is usu- ally chosen to give a freezing point below the ...... of aqueous solutions of ethyl alco- hol, specific heat of ammonia, thermal conductivity of sodium.

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The Equations for Thermophysical Properties of Aqueous Solutions ...

conductivity of aqueous solutions of sodium hydroxide is presented. The equations ... K. For more concentrated solutions at 16.5-47.4% values of heat ... sodium hydroxide. Richards and Hall [4] measured heat capacity of solutions at concentrations 0.14-. 27.8% at temperatures from 288 to 293 K. Gucker and Schminke [5]...

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The formation of micelles in aqueous solution is accompanied by a ...

ABSTRACT. Differential enthalpies of solution in water of crystalline sodium dodecyl sulphate (SDS), sodium p- ... (CTAB) have been measured as a function of concentration at temperatures between 25 and. 50°C. The ... solutes and the large heat capacity change for micelle formation arises from the loss of hydrophobic...

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HEATS OF SOLUTION, HEATS OF DILUTION, AND SPECIFIC ...

points in aqueous solutions, and the free energies of formation of the solid ... C”,, heat capacity of solvent or solute in infinitely dilute solution;. 'pc, apparent molal heat capacity of solute (+Q = (C, - n,f?,r)/n,);. C,, partial molal heat capacity of solvent or ..... than in concentrated solutions and the sign of AH of dilution is positive.

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Thermodynamic properties of aqueous solutions of sodium ...

The enthalpies of solution and dilution of aqueous solutions of sodium ibuprofen (NaIBP) with concentrations of m < 1.4 mol/kg water are measured at 293.15, 298.15, 308.15, and 318.5 K using an isoperibolic calorimeter. The heat capacity of NaIBP in the temperature range of 273.15–528.15 K is measured using a DSC...

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Properties Model for Aqueous Sodium Chloride Solutions near the ...

Oct 14, 2005 ... 2.3.2 Heats of Dilution and Heat Capacities in the Critical Region of. Water. ..... The isochoric heat capacities of pure water and of aqueous KCl solutions at ..... lithium chloride m molal concentration. M molar molecular mass. MgCl2 magnesium chloride n. (1) number of moles. (2) number of components. NA.

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State of hydration shells of sodium chloride in aqueous solutions in ...

Jan 8, 2009 ... On the basis of the measurements of the speed of ultrasound, density, and isobaric heat capacity, isentropic compressibilities of aqueous solutions of sodium chloride (from dilute up to highly concentrated) have been determined at 273.15-373.15 K. With the use of correct correlations, at electrolyte...

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Sodium acetate - Wikipedia

Sodium acetate, CH3COONa, also abbreviated NaOAc, is the sodium salt of acetic acid. This colorless deliquescent salt has a wide range of uses. Contents. [hide]. 1 Applications. 1.1 Industrial; 1.2 Concrete longevity; 1.3 Food; 1.4 Buffer solution; 1.5 Heating pad. 2 Preparation; 3 Reactions; 4 References; 5 External links...

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Thermal and volumetric properties of complex aqueous ... - Hal

May 13, 2016 ... the heat capacity ( ) and the density (ρ) of aqueous solutions up to high concentrations. Their implementation in PHREEQC V.3 (Parkhurst and Appelo, 2013) is described and has led to a new numerical ... (Na2SO4-H2O and MgSO4-H2O), for the quaternary K-Na-Cl-SO4 system (heat capacity only).

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Temperature and Concentration Dependence of Heat Capacity of ...

Heat capacities of binary aqueous solutions of different concentrations of sucrose, glucose, fructose, citric acid, malic acid, and inorganic salts were measured with a differential scanning calorimeter in the temperature range from 5°C to 65°C. Heat capacity increased with increasing water content and increasing temperature...

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