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Thermodynamic functions at saturation of several metal sulfates in aqueous sulfuric and deuterosulfuric acids at temperatures up to 350/sup 0/C

Journal Article · · J. Inorg. Nucl. Chem.; (United States)

From solubilities of several metal sulfates in aqueous solutions of sulfuric and deuterosulfuric acids at temperatures up to 350/sup 0/C, together with second ionization quotients (Q/sub 2/) of the acids, solubility products (Q/sub sp/) have been calculated. When isothermal values of log Q/sub sp/ in solutions of widely varying molality of acid were plotted against an extended Debye--Hueckel equation, the extrapolation to zero ionic strength yielded a solubility product constant (K/sub sp/). Solubilities interpreted in this manner were those for MgSO/sub 4/.H/sub 2/O, NiSO/sub 4/.H/sub 2/O, CaSO/sub 4/.2H/sub 2/O, CaSO/sub 4/.1/2H/sub 2/O, CaSO/sub 4/, Li/sub 2/SO/sub 4/ and Na/sub 2/SO/sub 4/ in H/sub 2/SO/sub 4/-H/sub 2/O solutions and for MgSO/sub 4/.D/sub 2/O, NiSO/sub 4/.D/sub 2/O, and Li/sub 2/SO/sub 4/ in D/sub 2/SO/sub 4/-D/sub 2/O solutions. With the exceptions of CaSO/sub 4/.2H/sub 2/O and CaSO/sub 4/.1/2H/sub 2/O studied only at 25 to 60/sup 0/C and 125/sup 0/C, respectively, all solubilities of salts were evaluated at temperatures from 200 to 350/sup 0/C. Adherence to extended Debye--Hueckel theory was good, and provided a method for calculating mean activity coefficients of the several separate salts in the acidic media. Values of log K/sub sp/ for each metal sulfate were plotted against 1/T (/sup 0/K) to yield thermodynamic functions. Similarities in behavior between the saturated H/sub 2/SO/sub 4/-H/sub 2/O and D/sub 2/SO/sub 4/-D/sub 2/O solutions and between Li/sub 2/SO/sub 4/ and Na/sub 2/SO/sub 4/ solubilities are described.

Research Organization:
Oak Ridge National Lab., TN
OSTI ID:
7190928
Journal Information:
J. Inorg. Nucl. Chem.; (United States), Journal Name: J. Inorg. Nucl. Chem.; (United States) Vol. 37:10; ISSN JINCA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM SULFATES
DEUTERIUM
DEUTERIUM COMPOUNDS
HIGH TEMPERATURE
HYDRATES
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INORGANIC ACIDS
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
LITHIUM COMPOUNDS
LITHIUM SULFATES
MAGNESIUM COMPOUNDS
MAGNESIUM SULFATES
MEDIUM TEMPERATURE
NICKEL COMPOUNDS
NICKEL SULFATES
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SODIUM COMPOUNDS
SODIUM SULFATES
SOLUBILITY
STABLE ISOTOPES
SULFATES
SULFUR COMPOUNDS
SULFURIC ACID
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS