Exploring Metal Corrosion Rates at Anode of Electrolytic Cell and Negative Electrode of Primary Cell by Digital Handheld Technology
CHEN Bo-Yin1, QIAN Yang-Yi1, LI Yan-Ping1, DENG Feng1, LIN Jian-Fen2
1. Institute of Chemistry Education and Resources, South China Normal University, Guangzhou 510006, China;
2. Shenzhen Lanling School, Shenzhen 518117, China
Abstract This paper designed 6 experiments to explore corrosion rates of metals at anode of electrolytic cell and negative electrode of primary cell using hand-held technology, and converted the metal corrosion rates to gas production rates when metal corroding, which further converted to the change of pressure in a closed system within a certain time. The key of these experiments was measuring the change of pressure by the pressure sensor. This paper got the pressure-time variation data and analyzed the reaction rates according to the slope of the curve. Moreover, this paper presented and analyzed the curves from the point of view of quadruple representation "macro-curve-micro-symbol" in order to help students to understand the experimental process.The conclusions were:(1) in the same electrolyte solution, the corrosion caused by the electrolytic cell was faster than the corrosion caused by the primary cell; (2) generally in the same electrolyte solution, for a certain range of concentration, the higher concentration of the electrolyte solution, the faster of corrosion.
CHEN Bo-Yin, QIAN Yang-Yi, LI Yan-Ping, DENG Feng, LIN Jian-Fen. Exploring Metal Corrosion Rates at Anode of Electrolytic Cell and Negative Electrode of Primary Cell by Digital Handheld Technology[J]. Chinese Journal of Chemical Education, 2016, 37(21): 48-54.
