National Changhua University of Education Institutional Repository : Item 987654321/10434
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题名: 開發普通化學實驗課程的消費者化學實驗並評估其可行性
Development of Consumer Chemistry Experiments in General Chemistry Laboratory Course and the Evaluation for its Feasibility
作者: 楊水平
贡献者: 化學系
关键词: 制酸劑;消費者化學;錯合滴定法;錯合逆滴定法;定量分析;普通化學實驗和化學教育研究
Antacids;Consumer Chemistry;Complexometric Titration;Complexometric back Titration;Quantitative Analysis;General Chemistry Laboratory and Chemical Education Research
日期: 2003
上传时间: 2012-05-23T02:28:42Z
出版者: 行政院國家科學委員會
摘要: 普通化學實驗的藥品大多數取自於化學藥品公司，鮮少利用消費者產品。這個缺點是實
驗的探究過程過於理想化，也無法融入真正的生活之中，因而學生學習的興趣低落，以致解
決化學的能力不足。本研究的目的是開發一個制酸劑金屬離子含量的定量分析，此實驗非常
有別於傳統的制酸劑之制酸力測定。
在此文章中，描述一個被分為三種分析方法的實驗設計，此是利用錯合滴定法和錯合逆
滴定法來測定制酸劑金屬離子的含量，此實驗含有一份新開發的實驗教材適用於普通化學實
驗和分析化學實驗兩課程。學生能夠學到有關樣品製備、錯合滴定法、錯合逆滴定法、金屬
指示劑、緩衝溶液、錯合物形成、遮蔽和阻塞。
藉由統計分析來評估此實驗的精確度和準確度，結果顯示：由不同的分析者利用此三種
分析方法測定制酸劑金屬離子的含量，學生與老師之間沒有顯著的差異。再者，由老師利用
此三種分析方法的不同方式測定其含量，實驗方式和計算方式的比較結果兩者之間沒有顯著
的差異。學生的結果顯示亦復如此。這些結果證實此實驗的可行性。學生對此實驗的反應也
持高度正面的評價。
Chemicals required for chemistry laboratory are mostly obtained from chemical companies.
Few chemical experiments use reagents from commercial sources. Nowadays, students’ interest in
chemistry is usually suffered from the lack of relevance of chemistry lectures and laboratories to
their daily lives, which ultimately lead to students’insufficient abilities in chemical problem
solving. This article presents a newly designed experiment for the determinations of metallic ions in
commercial antacids using uncommon titrations, suitable for general chemistry laboratory and
introductory quantitative analysis laboratory curriculums.
This experiment involves three new protocols designed for the determination of aluminum and
magnesium contents in commercial antacids by complexometric titration and back titration. This
newly developed experiment is very different from the quantitative analysis of acid-neutralizing
power of anions in antacids described in textbooks. In the experiment, students can learn various
concepts and techniques of sample preparation, complexometric titration and its back titration,
metallic indicators, uses of buffer solution, complex formations, masking, and blocking.
Results indicate three protocols are no significant difference in average and precision by
different analysts between students and instructor. Besides, results show there are no significant
difference in average and precision of different protocols between experiment and calculation
performed by instructor, and results point out the same as by students. These results verify the
feasibility of three protocols. In general, student comments on the experiment designs are highly
positive.
關聯: 國科會計畫, 計畫編號: NSC92-2511-S018-010; 研究期間: 9208-9307
显示于类别:[化學系] 國科會計畫

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