{"title":"Preparing Potassium Dihydrogen Phosphate Using Waste Phosphoric Acid: A Green Chemistry Experiment","authors":"Da-Zhi Tan*, Qi-Yun Zhang, Tong-Tong Chen, Wen-Jie Fan* and Yi-Ning Li*, ","doi":"10.1021/acs.jchemed.4c00725","DOIUrl":null,"url":null,"abstract":"<p >A green chemistry experiment was designed to produce potassium dihydrogen phosphate from the phosphoric acid waste generated by the classic organic chemistry experiment “Preparation of Cyclohexene.” The waste was treated with concentrated phosphoric acid at high temperatures to promote the polymerization and carbonization of organic matter, followed by filtration and activated carbon adsorption to remove impurities. The concentration of the resulting phosphoric acid solution was determined by titration, and K<sub>2</sub>CO<sub>3</sub> was added to convert the phosphoric acid to potassium dihydrogen phosphate. Finally, potassium dihydrogen phosphate crystals were obtained by crystallization, filtration, and drying. Green chemistry injects the concept of sustainable development into experiments, transforming originally wasted concentrated phosphoric acid into potassium dihydrogen phosphate, which can be used as a fertilizer for plants. This not only cultivates students’ environmental awareness and innovative spirit but also achieves positive teaching outcomes.</p>","PeriodicalId":43,"journal":{"name":"Journal of Chemical Education","volume":"102 2","pages":"783–786 783–786"},"PeriodicalIF":2.9000,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Chemical Education","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.jchemed.4c00725","RegionNum":3,"RegionCategory":"教育学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
A green chemistry experiment was designed to produce potassium dihydrogen phosphate from the phosphoric acid waste generated by the classic organic chemistry experiment “Preparation of Cyclohexene.” The waste was treated with concentrated phosphoric acid at high temperatures to promote the polymerization and carbonization of organic matter, followed by filtration and activated carbon adsorption to remove impurities. The concentration of the resulting phosphoric acid solution was determined by titration, and K2CO3 was added to convert the phosphoric acid to potassium dihydrogen phosphate. Finally, potassium dihydrogen phosphate crystals were obtained by crystallization, filtration, and drying. Green chemistry injects the concept of sustainable development into experiments, transforming originally wasted concentrated phosphoric acid into potassium dihydrogen phosphate, which can be used as a fertilizer for plants. This not only cultivates students’ environmental awareness and innovative spirit but also achieves positive teaching outcomes.
期刊介绍：
The Journal of Chemical Education is the official journal of the Division of Chemical Education of the American Chemical Society, co-published with the American Chemical Society Publications Division. Launched in 1924, the Journal of Chemical Education is the world’s premier chemical education journal. The Journal publishes peer-reviewed articles and related information as a resource to those in the field of chemical education and to those institutions that serve them. JCE typically addresses chemical content, activities, laboratory experiments, instructional methods, and pedagogies. The Journal serves as a means of communication among people across the world who are interested in the teaching and learning of chemistry. This includes instructors of chemistry from middle school through graduate school, professional staff who support these teaching activities, as well as some scientists in commerce, industry, and government.
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