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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 15 (2010) pp 471-473

Isomerization Kinetics of Potassium Diaquobis(oxalato)chromate(III)

João Sotomayor

REQUIMTE, Departamento de Química, Universidade Nova de Lisboa, Quinta da Torre, 2829-516 Caparica, PORTUGAL jcs@dq.fct.unl.pt
Received June 17, 2010. Accepted September 23, 2010.

Published: 31 December 2010

Abstract. The trans-cis isomerization of diaquobis(oxalato)chromate(III)ion in aqueous solution, catalyzed by perchloric acid, is reported. The rate of the trans-cis isomerization was followed by spectrophotometry, showing a first-order reaction with respect to the chromate(III) ion. The rate was determined at different temperatures and enabled the calculation of the activation energy and both enthalpy and entropy of activation according to Transition State Theory.

Key Words: Laboratories and Demonstrations; general chemistry

(*) Corresponding author. (E-mail: jcs@dq.fct.unl.pt)

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