Temperature dependence of the equilibrium CH/sub 2/(OH)/sub 2/ + HSO/sub 3//sup -/ = CH/sub 2/(OH)SO/sub 3//sup -/ + H/sub 2/O in aqueous solution
Ultraviolet absorption spectrometry was used to measure concentrations of bisulfite in thermal equilibrium with formaldehyde and hydroxymethanesulfonate in deaerated, argon-saturated aqueous solutions. The equilibrium constant of the title reaction was determined as a function of temperature in the range 288-318 K for pH values of 5-6, and at 298 K as a function of pH in the range 4.1-9.7. The temperature dependence (at pH 5-6) is represented by log 1/K/sub 1a/ = (2854 +/- 59)/T - (3.0 +/- 0.2) which leads to values for the reaction enthalpy and entropy of (-54.60 +/- 1.10) kJ/mol and (57.6 +/- 3.7) J/(mol K), respectively. The pH dependence of the equilibrium is shown to result from the equilibrium between sulfite and bisulfite. Finally, the decomposition of hydroxymethanesulfonate was studied at 25/sup 0/C. The effective rate coefficient is 1.1 x 10/sup -5/ s/sup -1/ at pH 5.6. The value is compared with other recent data.
- Research Organization:
- Johannes-Gutenberg-Universitaet, Mainz, West Germany
- OSTI ID:
- 5532914
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 90:14
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
ACID SULFITES
CHEMICAL REACTION KINETICS
FORMALDEHYDE
SULFONIC ACID ESTERS
DECOMPOSITION
ABSORPTION SPECTROSCOPY
ACID RAIN
AQUEOUS SOLUTIONS
ARGON
EXPERIMENTAL DATA
PH VALUE
ULTRAVIOLET SPECTRA
ALDEHYDES
ATMOSPHERIC PRECIPITATIONS
CHEMICAL REACTIONS
DATA
DISPERSIONS
ELEMENTS
ESTERS
FLUIDS
GASES
INFORMATION
KINETICS
MIXTURES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
RAIN
RARE GASES
REACTION KINETICS
SOLUTIONS
SPECTRA
SPECTROSCOPY
SULFITES
SULFUR COMPOUNDS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)