University Chemistry ›› 2022, Vol. 37 ›› Issue (5): 2111078.doi: 10.3866/PKU.DXHX202111078

Special Issue: 第2届全国大学生化学实验创新设计竞赛

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Development and Exploration of Potassium Sulfate Preparation Experiment Guided by Quaternary Phase Diagrams in Undergraduate Experimental Teaching

Yangchao Peng, Wang Hu, Yuang Liu, Yong Fan, Wanchun Zhu, Zhiguang Song, Qiang Ma, Yupeng Guo()   

  • Received:2021-11-26 Accepted:2021-12-07 Published:2022-04-07
  • Contact: Yupeng Guo


The preparation of potassium sulfate using a two-step method is an important method for the large-scale production of potassium fertilizer. Our experiment uses it as a reference, taking the basic knowledge of the quaternary phase diagram as the theoretical guideline, and covers the relevant knowledge of inorganic double decomposition reactions and element ion analysis detection. In this study, we use a combination of testing methods including traditional titration, spectrophotometry, and ICP atomic emission. This promotes basic operational knowledge and theory, as well as a combination of traditional and modern instrumental analysis. The experiment has many advantages, such as easily obtainable materials, easy operation, obvious phenomena, and green environmental protection. It can be used in modular teaching and divided into multiple experimental links to meet the requirements of different students. The operation of the experiment can not only make students realize the important role of chemistry in social production but also cultivate their basic operational ability and improve their basic practice and innovation ability.

Key words: Two-step, Tetrad phase diagram, Green chemistry, Modular teaching, Groups investigation


  • G64