Thermodynamics of hydrogen-isotope-exchange reactions. 5. Determination of K and. delta. S/sup 0/ for the reaction OD/sup -/(daq) + HS/sup -/(aq) reversible OH/sup -/(aq) + DS/sup -/(daq)

Journal Article · Thu Jun 16 04:00:00 EDT 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100323a020· OSTI ID:6083579

Chang, O K; Rock, P A

This paper reports the authors results for the experimental determination of the equilibrium constant and its temperature dependence for the solution-phase hydrogen-isotope-exchange reaction OD/sup -/(daq) + HS/sup -/(aq) reversible OH/sup -/(aq) + DS/sup -/(daq). The results were obtained from measurements on electrochemical double cells of the type Pt(s) absolute value D/sub 2/(g) Na/sub 2/S(daq) HgS(s) Hg(l) absolute value HgS(s) Na/sub 2/S(aq) H/sub 2/(g) Pt(s) and analogous cells involving silver sulfide-silver electrodes in place of the mercuric sulfide-mercury electrodes. The experimental value of the equilibrium constant at 25.0 /sup 0/C for the reaction is K = 0.534 +/- 0.011; the experimental value of the standard entropy change at 25.0 /sup 0/C for the reaction is ..delta..S/sup 0/ = 7.0 +/- 1.8 J x K/sup -1/.

• Research Organization: Univ. of California, Davis (USA)
• OSTI ID: 6083579
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:12; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202* -- Isotope Effects
Isotope Exchange
& Isotope Separation
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DEUTERIUM COMPOUNDS
DISPERSIONS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
ISOTOPIC EXCHANGE
MERCURY COMPOUNDS
MERCURY SULFIDES
MIXTURES
NUMERICAL DATA
OXYGEN COMPOUNDS
SOLUTIONS
SULFIDES
SULFUR COMPOUNDS
THERMODYNAMICS
WATER