하이드로젤 속 산-염기 반응을 이용한 느린 확산의 시각화 실험 개발
Development of Experiments Visualizing Slow Diffusion, Using Acid-Base Reaction in a Hydrogel
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하이드로젤 내에서의 느린 확산과 산-염기 반응에 따른 지시약의 색 변화를 이용하여 세 가지 학교 실험을 개발하였다. 한 이온 물질과 지시약을 포함하고 있는 하이드로젤로 반대되는 이온을 확산시켰다. 수용액 속 이온의 농도가 높을수록 확산 거리가 증가하였고 확산이 진행됨에 따라 확산 속도는 감소하였다. 이를 통하여 픽의 법칙을 시각적으로 간단하게 보여주었다. 매질의 산과 염기 순서를 뒤바꿔보는 실험을 통해 수소 이온이 수산화 이온보다 빠르게 확산된 것을 확인할 수 있었으며, 수소 이온의 수화 반지름이 수산화 이온의 수화 반지름보다 작은 것을 확인할 수 있다. 또한, 다양한 지시약의 색 변화를 하이드로젤에 공간적으로 나타냄으로써, 지시약의 연속적 변색을 시각적으로 확인할 수 있었다.
Abstract
Three kinds of school experiments have been developed using slow diffusion in a hydrogel and color change of indicators in the acid-base reaction.The counter ion in the solution diffused into a hydrogel containing an ion and indicator. The diffusion distance increased as a function of the ion concentration and diffusion rate decreased as the diffusion proceeded. Fick’s law was simply visualized through these phenomena. In the experiment exchanging acid and base in the medium, it has been demonstrated that hydrogen ion diffused fast than hydroxide ion, which indicates that hydrodynamic radius of hydrogen ion is smaller than that of hydroxide ion. In addition, a color change of various indicators was spatially visualized in a hydrogel, which is beneficial to understand continuous color change of indicators.
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