Application of Modern Analytical Technology in Junior High School Chemistry Teaching: Reconsideration of Hard Water and Soft Water
ZHANG Hao1,2, FU Geng-Tao1**, CHEN Kai3**, TANG Ya-Wen1
1. School of Education Science, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China; 2. Nanjing No.13 Middle School Suojin Branch, Nanjing 210042, China; 3.School of Environmental Science, Nanjing Xiaozhuang University, Nanjing 211171, China
Abstract In order to solve students’ questions about hard water and soft water, the quantitative criteria of hard or soft water and the factors affecting water hardness were investigated by means of inductively coupled plasma atomic emission spectrometry (ICP-AES). The results showed that: the hardness of water decreased with increasing temperature; With the increase of pH, especially when the alkalinity was very strong, the hardness of water decreased sharply, and when the pH decreased, the hardness of water decreased very little; Different types of water had different hardness; Some water purifiers softened hard water better than boiling. The application of modern analytical technology in junior high school chemistry teaching can change students’ learning mode and thinking mode, broaden their horizons of scientific inquiry.
ZHANG Hao, FU Geng-Tao, CHEN Kai, TANG Ya-Wen. Application of Modern Analytical Technology in Junior High School Chemistry Teaching: Reconsideration of Hard Water and Soft Water[J]. Chinese Journal of Chemical Education, 2025, 46(9): 94-99.
