Excess Thermodynamic Properties of Cyclopentane – Isomeric Decalin Systems at 25 °C

Thermodynamic behavior of FeCl3-H2O and HCl-FeCl3-H2O systems - A Pitzer Model at 25°C

Most of the speciation models of aqueous electrolyte systems are based on the “ion pairing and complexing approach”. They are only suitable for aqueous solutions with ionic strengths lower than about 1 eq.kgw . For highly saline solutions, an approach based on “specific-ion interactions” (the so-called “Pitzer approach”) provides much more accurate results. Various thermodynamic databases suppo...

Spectrophotometric Determination of the Thermodynamic pK Value of Picric Acid in Water at 25 °C

The thermodynamic p K value of picric acid was determined spectrophotometrically in water containing hydrochloric acid to repress the ionization. The pK value 0.33 ( i£«0 .46) was obtained from da ta a t 450 m/*. At tempts to determine the p K value by potent iometr ic t i t rat ions of picric acid and by spectrophotometric measurements of picric acid solutions in the near-saturat ion range did...

EXCESS THERMODYNAMIC PROPERTIES CALCULATIONS FOR ALCOHOLS IN INERT SOLVENTS BASED ON FOURIER TRANSFORM INFRARED SPECTROSCOPY MEASUREMENTS

Self-association of alcohols; including ethanol, methanol, cyclopentanol and octanol in separate mixtures with inert solvents have been studied using FT-IR spectroscopy. Except for the band at 3640 cm–1 in the IR spectrum of the alcohols which is due to the monomer species, the presence of other bands in the region of stretching vibrational frequencies of OH (3100-3700 cm–1) are attributed to t...

THERMODYNAMIC MODELING IN THE Na-NO3-SO4-Cl-OH-H2O CHEMICAL SYSTEM AT 25 °C

Ionization of Hydrofluoric Acid at 25 °C*

The io niza tion constant, K" fo r the reaction HF:;:2 H + + F was ca lc ul ated on the ba s is of pote ntio· metric measure me nt s in the cell Ag; AgCl , CI , F II La F"II Na F, HCI, 1-1 , 0 1 KCI(Sa td .), I-I g,Cl 2 ; Hg at 25 °C. A leas t squ a res procedure was a ppli ed to the ex pe rime nt a l da ta yie lding a bes t es tim a te fo r K, of 5 .85 X 10 4 with a s tanda rd e rror of 0.03 X...