Experiments of Equilibrium Shift with Nitrogen Dioxide for Upper Secondary School

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  • 高等学校化学における二酸化窒素を用いた化学平衡の移動実験
  • 高等学校化学における二酸化窒素を用いた化学平衡の移動実験 : マイクロスケール実験による教材開発及び授業実践
  • コウトウ ガッコウ カガク ニ オケル ニサンカ チッソ オ モチイタ カガク ヘイコウ ノ イドウ ジッケン : マイクロスケール ジッケン ニ ヨル キョウザイ カイハツ オヨビ ジュギョウ ジッセン
  • —Development of Teaching Materials and Class Report on the Microscale Experiments—
  • ―マイクロスケール実験による教材開発及び授業実践―

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Abstract

Experimental materials of chemical equilibrium between nitrogen dioxide and dinitrogen tetroxide are mentioned in many textbooks for upper secondary school chemistry. However, they involve several problems yet to be solved for use in classrooms because concentrated nitric acid and toxic nitrogen dioxide giving off fumes. Furthermore, the observation of changes in color of nitrogen oxide with equilibrium shift is difficult for instantaneous reactions.In this study, we developed materials for teaching chemical equilibrium with nitrogen dioxide based on a microscale experiment using a syringe and stopper cocks. Individual experiments in a classroom made it possible for students to repeatedly observe and confirm the changes in color. Also, using a microscale experiment could impart to the students a secure procedure for the handling of chemical reagents.<br>Using the developed experiments with a microscale device, we taught public upper secondary school students and examined its effectiveness as a teaching material. The analysis of a questionnaire confirmed that individual experiments, which are characteristic of microscale experiments, encouraged students to understand chemical equilibrium with insightful realizations of the processes involved.

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