Gaseous Species in the Vaporization of Sodium and Potassium Hydroxide

The data on thermodynamic and molecular properties of the lithium and sodium hydroxides have been collected, critically reviewed, analyzed, and evaluated. Tables of thermodynamic properties (C; ,<1>0 =-(Go-HO(O)/T, So, HO-HO(O), tJ.fHo, tJ.rG°) of these hydroxides in the condensed and gaseous states have been calculated using the results of the analysis and some estimated values. The recommendations are compared with earlier evaluations given in the JANAF Thermochemical Tables and Thermodynamic Properties of Individual Substances. The properties considered are: the temperature and enthalpy of phase transitions and fusion, heat capacities, spectroscopic data, structures, bond energies. and enthalpies of formation at 298.15 K. The thermodynamic functions in solid, liquid, and gaseous states are calculated from T= 0 to 2000 K for substances in condensed phase and up to 6000 K for gases.

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“…The value P(Na202 H2)= 1.3X 10-7 atm (T=666 K) is given in [58PORlSCH2] for the system NaOH-KOH with an activity of NaOH not far from unity.…”

mentioning

confidence: 99%

Thermodynamic Properties of Alkali Metal Hydroxides. Part 1. Lithium and Sodium Hydroxides

Gurvich

Bergman

Gorokhov

et al. 1996

Journal of Physical and Chemical Reference Data

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“…The vapor pressure data available on hydroxides indicate that only the hydroxides of the alkali metals and alkaline earths offer promise as seeding materials. The appearance potentials of species originating from the alkali hydroxides and mixtures of alkali hydroxides have been measured (35)(36)(37)(38)(39)(40)(41)(42) and are generally 4 to 5 ev above the potential of the metal atom. Apparently appearance potential measurements have not been made on the alkaline earth hydroxides, but the species SrOH, CaOH, and BaOH have been observed in flames (43)(44)(45).…”

Section: Thermodynamic Data Of Compoundsmentioning

confidence: 99%

Seeding of Gases for Magnetohydrodynamic Applications

Foley

1962

ARS Journal

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To achieve sufficiently high electron concentrations at reasonable temperatures for MHD applications, a general approach using seeding compounds rather than elements is discussed together with an extensive survey of the literature. Several examples are given in which the ionization potential of a compound is lower than the elements composing the compound. A trend in the ionization potential to decrease with decreasing valency unsaturation is noted, and some evidence for this is given.

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“…Porter and Schoonmaker (364,366,367,412,415) and on ferrous chloride (413) and ferrous bromide (368). Observations on alkali halides are reported by several investigators (23,61,365,411,414)• A Knudsen cell effusion method is used to measure the vapor pressure of thorium tetrafluoride (92), and to determine proportionality response of the mass spectrometer to partial pressure of different species (336).…”

Section: Applications To Chemical Physics and Physical Chemistrymentioning

confidence: 99%