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Sailing on the "C": A Vitamin Titration with a Twist
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Abstract
The experiment takes the traditional redox titration of vitamin C using iodine with starch as an indicator, and presents it to the student as a challenge in guided-inquiry format. Two versions, with different levels of difficulty, are provided, to accommodate students with varying levels of problem-solving skills. The "challenge" is both quantitative and qualitative: if you were an eighteenth-century sea captain packing for a voyage to the New World, would you take oranges, lemons, limes, or grapefruits to prevent your crew from getting scurvy? The challenge ties in history, nutrition, and health with chemistry, and provides students an opportunity to work with familiar food products in the laboratory.
Keywords (Audience):
High School / Introductory ChemistryKeywords (Domain):
Laboratory InstructionKeywords (Pedagogy):
Inquiry-Based / Discovery LearningKeywords (Subject):
Titration / Volumetric AnalysisCiting Articles
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This article has been cited by 6 ACS Journal articles (5 most recent appear below).
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Etinosa Edionwe, John R. Villarreal, and K. Christopher SmithJournal of Chemical Education2011 Article ASAPA laboratory experiment that spectrophotometrically determines the percent of cranberry juice in cranberry–apple juice is described. The experiment involves recording an absorption spectrum of cranberry juice to determine the wavelength of maximum ...
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K. Christopher Smith, Etinosa Edionwe, and Bayyinah MichelJournal of Chemical Education2010 87 (11), 1217-1221A predict−observe−explain framework is used to explore conductimetric titrations of a hydrochloric acid−sodium hydroxide (strong acid−strong base) and an acetic acid−sodium hydroxide (weak acid−strong base) system in which all components are soluble. In ...
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Paul S. MatsumotoJournal of Chemical Education2006 83 (11), 1649In high school, many students do not have an opportunity to learn or use statistics. Because statistics is a powerful tool and many students take a statistics class in college, prior exposure to statistics in a chemistry course (or another course) would ...
The Great Wakonse Earthquake of 2003: A Short, Problem-Based Introduction to the Titration Concept
Brian P. Coppola , Amy C. Gottfried , Robyn L. Gdula , Alan L. Kiste and Nathan W. OckwigJournal of Chemical Education2006 83 (4), 600The Great Wakonse Earthquake of 2003: A Short, Problem-Based Introduction to the Titration Concept
Brian P. Coppola , Amy C. Gottfried , Robyn L. Gdula , Alan L. Kiste and Nathan W. OckwigJournal of Chemical Education2006 83 (4), 600Titration is both an act and a concept. Using a collaborative-learning context, we created an activity that introduces new learners (nonscience adult learners) to the concept of titration from real-world instructions about earthquake water safety found in ...
Studying Current-Potential Curves Using Bipotentiometric Iodometric Back-Titration for the Determination of Ascorbic Acid in Fruits and Vegetables
Roxana A. Verdini and Claudia M. LagierJournal of Chemical Education2004 81 (10), 1482Studying Current-Potential Curves Using Bipotentiometric Iodometric Back-Titration for the Determination of Ascorbic Acid in Fruits and Vegetables
Roxana A. Verdini and Claudia M. LagierJournal of Chemical Education2004 81 (10), 1482A method for the determination of the ascorbic acid content in fruits and vegetables was used to introduce the principles of voltammetry. The procedure combines an iodometric back-titration with voltammetric (bipotentiometric) end point detection, which ...
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- Received: August 03, 2009
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