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 00:00:00 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), Vol. 92:12
• Country of Publication: United States
• Language: English

Related Subjects

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