Abstract Based on handheld technology, the influence of co-ionic effect and salt effect on precipitation and dissolution equilibrium of Mg(OH)2 were explored. By combining the macroscopic change of Mg(OH)2 aqueous solution with the experimental curve, the microcosmic reaction principle was deduced and characterized by the reversible equation and other symbolic forms. Thus, students' evidential reasoning ability and “quadruple representation” thinking mode were cultivated, and provided new materials for relevant teaching. In addition, in view of the “abnormal” phenomenon in the experiment process, students were guided to make assumptions, design experimental schemes and other activities. These exploration activities not only developed students' critical questioning thinking, innovative spirit, conflict resolution and flexible thinking abilities, but also implemented the cultivation of core literacy of “scientific inquiry” and “scientific attitude”.
SU Shu-Fen, YANG Fa-Fu. Exploring Influence of Ion Concentration on Precipitation-Dissolution Equilibrium Based on Handheld Technology:Co-Ionic Effect and Salt Effect[J]. Chinese Journal of Chemical Education, 2023, 44(1): 107-112.
