Kinetic isotope effect in dehydration of ionic solids. II. The kinetics of dehydration of calcium oxalate monohydrate

Journal Article · Thu Dec 29 00:00:00 EST 1977 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100541a012· OSTI ID:5343669

Manche, E P ^[1]; Carroll, B

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1. York Coll. of the City Univ. of New York, Jamaica

The kinetics of the isothermal dehydration of the protonated and deuterated monohydrate of calcium oxalate has been investigated at 120, 150, and 170/sup 0/C. The rate of dehydration for these salts was found to be k/sub H//k/sub D/ = 1.025 +- 0.012. This result rules out the enormous kinetic isotope effect as given in the literature. An isotope effect of a few percent is not ruled out; this magnitude is in keeping with that found by Heinzinger in other dehydration processes. An estimated difference of about 150 cal/mol between the heat of desorption for H/sub 2/O and D/sub 2/O should have led to a ratio, k/sub h//k/sub D/ = 1.20. The smaller observed ratio has been explained on the basis of a compensation effect and may be considered an example of the Barclay--Butler correlation.

• OSTI ID: 5343669
• Journal Information: J. Phys. Chem.; (United States), Vol. 81:26
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DEUTERIUM
ISOTOPE EFFECTS
CALCIUM COMPOUNDS
CHEMICAL REACTION KINETICS
DEHYDRATION
HIGH TEMPERATURE
HYDRATES
OXALATES
ALKALINE EARTH METAL COMPOUNDS
CARBOXYLIC ACID SALTS
HYDROGEN ISOTOPES
ISOTOPES
KINETICS
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
REACTION KINETICS
STABLE ISOTOPES
400202* - Isotope Effects
Isotope Exchange
& Isotope Separation