Chemistry of breathalyzer: analysis of ethanol via redox reaction

Lai, Yuen Lu (2007) Chemistry of breathalyzer: analysis of ethanol via redox reaction. Universiti Malaysia Sabah. (Unpublished)

[img]
Preview
Text
ae0000000834.pdf

Download (2MB) | Preview

Abstract

The ethanol content of aqueous solutions and four beverage samples (Anglia Shandy, Jolly Shandy, Anchor beer and Sherry) were determined by back titration method and colorimetric method. Both methods are based on redox reaction between ethanol and acid dichromate. The analytical results showed that the ethanol contents of the aqueous solutions according back titration method was 0.14, 0.22, 0.33, 0.42 and 0.53% v/v, respectively, while for the beverages samples (Anglia Shandy, Jolly Shandy, Anchor beer and Sherry) was 6.6, 6.6, 5.0 and 31.0% v/v, respectively. Meanwhile, according to the colorimetric method, the ethanol content of aqueous solutions was 0.13, 0.22, 0.33, 0.56 and 0.62% v/v, respectively and beverages samples was 6.4, 6.4, 6.5 and 29.0% v/v, respectively. The concentrations obtained for the aqueous solution were relatively close to the actual values. By contrast, the concentrations obtained for the beverage samples were higher compared to the actual values.

Item Type: Academic Exercise
Keyword: Ethanol, Aqueous solutions, Alcohol beverage, Redox reaction
Subjects: T Technology > TP Chemical technology > TP1-1185 Chemical technology > TP500-660 Fermentation industries. Beverages. Alcohol
Department: SCHOOL > School of Science and Technology
Depositing User: ADMIN ADMIN
Date Deposited: 02 Jan 2013 09:56
Last Modified: 13 Oct 2017 14:20
URI: https://eprints.ums.edu.my/id/eprint/5624

Actions (login required)

View Item View Item