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 (Unpublished)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