The Chemical Educator
ISSN: 1430-4171 (electronic version)
Abstract Volume 9
Issue 1 (2004) pp 39-41
Alternative Demonstrations of Slow Processes II: A Video Clip of One-Dimensional Waves in the Hypochlorite–Iodide–Water System
Vladimir M. Petruševski,* Marina Monkovic, and Metodija Najdoski
Institute of Chemistry, Faculty of Natural Sciences and Mathematics,
Sts. Cyril and Methodius University, Arhimedova 5, P.O. Box 162, 1000
Skopje, Republic of Macedonia, firstname.lastname@example.org
Published online: 1 January 2004
Abstract. A chemical wave was initiated in a system (test tube) containing an aqueous gel of potassium iodide and starch by carefully pouring an excess of bleaching solution (aqueous solution of sodium hypochlorite) over it. A blue disk is formed immediately at the boundary surface, which propagates slowly downwards. Photos (a total of 240) were taken with a digital camera (one snapshot every 20 s), and they were linked to give a video clip that may be used as a time-saving alternative to the classical demonstration.
Key Words: Laboratories and Demonstrations; physical chemistry; general chemistry; chemical waves; eraser and pencil analogy; gel media; video clip
(*) Corresponding author. (E-mail: email@example.com)
A 40-s movie (s00897040752asm.zip) (9.40 MB) showing propagation of the chemical wave in a clamped test tube is available as supporting material.
Issue date: February