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In the Laboratory
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Exploring Faraday's Law of Electrolysis Using Zinc–Air Batteries with Current Regulative Diodes
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Masahiro Kamata and Miei Paku
Department of Science Education, Faculty of Education, Tokyo Gakugei University, Tokyo 184-8501, Japan
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April 2007
Vol. 84 No. 4
p. 674
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| Abstract |
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Although electrolysis of an aqueous solution is often used to demonstrate Faraday's law, not only chemicals such as CuSO4 but also several elaborate devices such as an analytical balance, a dc power supply, and a dc ammeter are needed. In addition, a long time is required for students to obtain quantitative data. From such a viewpoint, we have developed a new educational experiment using zinc–air batteries (PR2330) and current regulative diode (CRD) arrays. Since a zinc–air battery uses the oxygen in the atmosphere as the cathode material, students were able to confirm Faraday's law of electrolysis by measuring the volume of oxygen absorbed and reacting in the battery. In addition, the combination of zinc–air batteries and CRDs made constant-current discharging possible without any dc power supply or ammeter to monitor it, which means the cost of the experiment is low and can be conducted in a classroom instead of a laboratory. Furthermore, the measurement can be accomplished in a short time (5 minutes) and the data is quantitative enough for educational purposes.
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| Supplement |
Instructions and a worksheet for the students are available.
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| More Information |
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Citation |
Kamata, Masahiro; Paku, Miei. J. Chem. Educ. 2007, 84, 674.
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Keywords |
Electrochemistry; Electrolytic / Galvanic Cells / Potentials; First-Year Undergraduate / General; Hands-On Learning / Manipulatives; High School / Introductory Chemistry; Laboratory Equipment / Apparatus; Laboratory Instruction; Oxidation / Reduction; Physical Chemistry; Second-Year Undergraduate
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History |
Created:
Last Updated: |
3/6/2007
3/8/2007
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 Caution! | | Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations. |
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