University Chemistry ›› 2021, Vol. 36 ›› Issue (6): 2006067.doi: 10.3866/PKU.DXHX202006067

• Chemistry Laboratory • Previous Articles     Next Articles

Determination of Alkali Hydroxide Concentration Based on Green Consideration

Xin Hu1, Fuling Yin2, Jun Yang1, Ming Zhao2,*()   

  1. 1 National Demonstration Center for Experimental Pharmacy Education in Peking University, Beijing 100191, China
    2 Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
  • Received:2020-06-23 Accepted:2020-08-19 Published:2020-09-16
  • Contact: Ming Zhao
  • About author:赵明, Email:


The classic experiment "determination of alkali hydroxide concentration" is widely used in chemical and pharmaceutical industries, as well as in university chemistry laboratory teaching. Therefore, disposal of the solutions produced by titration and prevention of their environmental pollution are very important in chemistry laboratory teaching, as well as in the industrial processes. We have selected the methods of visual colorimetry and potentiometric titration to determine potassium hydroxide concentration as an experiment for chemistry lab teaching based on green consideration. The solution produced by titration can be used directly in irrigating the plant, Spathiphyllum kochii. The teaching experiment will help students acquire methods for designing chemical experiments based on green consideration and inspire their interests of learning chemical courses.

Key words: Determination, Concentration, Potassium hydroxide, Aqueous solution, Green consideration


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