部分互溶双液系相图的绘制实验分享

doi:10.12461/PKU.DXHX202508080

Abstract

Abstract: In undergraduate phase diagram instruction, most institutions conventionally employ completely miscible binary liquid systems as teaching models. These systems involve measuring vapor-liquid equilibrium data at varying temperatures to construct phase diagrams, thereby validating phase diagram theory and enhancing students' conceptual understanding. Within this pedagogical context, our study investigates the partially miscible isobutyric acid and distilled water system, introducing an innovative experimental approach utilizing the height method for phase diagram construction. The experimental design is fundamentally based on the lever rule from phase diagram theory, with refractive index measurements serving as validation, ultimately yielding a well-defined “cap-shaped” phase diagram. Additionally, the modular teaching framework developed from this experimental design demonstrates adaptability to diverse instructional levels. Through multifaceted practical implementations, this approach effectively cultivates students' experimental design capabilities, data analysis skills, and comprehensive problem-solving competencies.

Key words: Partially miscible binary liquid system, Phase diagram, Lever rule, Height method

Qiong Ding, Chuqing Gong, Yunhua Chen, Faqiong Zhao, Haibo Zhang. Experimental sharing on the construction of phase diagrams for partially miscible binary liquid systems[J].University Chemistry, 2026, 41(9): 347-354.

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Experimental sharing on the construction of phase diagrams for partially miscible binary liquid systems

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