Precise Freezing-Point Depression Constant Determination in Water

TCE

The Chemical Educator

ISSN: 1430-4171 (electronic version)

Table of Contents

Abstract Volume x Issue x (2006) pp 281-282

Precise Freezing-Point Depression Constant Determination in Water

Roger Barth

Department of Chemistry, West Chester University, West Chester, PA 19383, rbarth@wcupa.edu
Received March 15, 2006. Accepted June 16, 2006.

Published online: 30 June 2006

Abstract. We outline a modern method for a freezing-point depression experiment for the physical chemistry laboratory. Freezing-point temperatures of glucose solutions in water are determined with a computer-interfaced temperature probe. Molal concentrations of glucose in the solutions are determined by refractive index. These measurements are used to compute the cryoscopic constant of water.

Key Words: Laboratories and Demonstrations; physical chemistry; colligative properties; freezing point depression; cryoscopic

(*) Corresponding author. (E-mail: rbarth@wcupa.edu)

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