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ERIC Number: EJ871150
Record Type: Journal
Publication Date: 2009-Mar
Pages: 3
Abstractor: As Provided
Reference Count: 2
ISBN: N/A
ISSN: ISSN-1449-6313
An Inquiry into the Effect of Heating on Ascorbic Acid
Yip, Din Yan
Teaching Science, v55 n1 p21-23 Mar 2009
Investigations that study the effect of heating on ascorbic acid are commonly performed in schools, but the conclusions obtained are quite variable and controversial. Some results indicate that heating may destroy vitamin C, but others suggest that heating may have no effect. This article reports an attempt to resolve this confusion through a series of experiments designed and performed by a cohort of biology teachers. They aimed to find out why variable results were obtained and how to ensure students obtain meaningful results. The following conclusions were obtained: the amount of ascorbic acid in ascorbic acid solution, Redoxon solution and fresh orange juice, at a pH of 5, remain constant at 100 degrees C; the amount of ascorbic acid in fresh orange juice remains relatively constant at 22 degrees C to 100 degrees C; Ascorbic acid content in a solution of ascorbic acid at acidic pH remains relatively constant at 100 degrees C, but is rapidly destroyed at 100 degrees C at alkaline pH. (Contains 3 tables.)
Australian Science Teachers Association. P.O. Box 334, Deakin West, ACT 2600, Australia. Tel: +61-02-6282-9377; Fax: +61-02-6282-9477; e-mail: publications@asta.edu.au; Web site: http://www.asta.edu.au/resources/teachingscience
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Secondary Education
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A