Abstract The industrial production of table salt is an ideal teaching material based on practical problem solving. The production environment in the salt field is safe and can be investigated, students can understand all production links, closely related to the part of the solution and coarse salt purification. “The journey of table salt:from salt in nature to salt on the table” as the project theme, carries out the teaching of “solution and crude salt purification” in chemistry course of junior high school. Through the inspection of Da-Qinghe salt field, discussing the problems in the process of salt production, salt washing and salt collection, explaining the core links and key issues of the actual production process, simulating the production process of salt, students construct concepts independently such as saturated solution and solubility, and master basic perating skills (such as dissolution, filtration, evaporation and crystallization), and establish a model of material separation.
LI Ran, LIN Hong-Yan, HUANG Yan-Ning, MA Xiao-Yan, WU Lan. Project-Based Learning of Junior High School Chemistry Based on Observation and Investigation of “Da-Qinghe Salt Field”:The “Journey” of Table Salt[J]. Chinese Journal of Chemical Education, 2021, 42(21): 52-59.