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Using Project-Based Learning To Design, Build, and Test Student-Made Photometer by Measuring the Unknown Concentration of Colored Substances
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2018-01-24 00:00:00 , DOI: 10.1021/acs.jchemed.7b00254 Chansyanah Diawati 1 , Liliasari 2 , Agus Setiabudi 2 , Buchari 3
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2018-01-24 00:00:00 , DOI: 10.1021/acs.jchemed.7b00254 Chansyanah Diawati 1 , Liliasari 2 , Agus Setiabudi 2 , Buchari 3
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Students learned the principles and practice of photometry through project-based learning. They addressed the challenge of measuring the unknown concentration of a colored substance using a photometer they were required to design, build, and test. Then, they used that instrument to carry out the experiment and fulfill the challenge. A photometer was designed and built by students consisting of a green laser pointer as the light source and a lux meter as the detector and readout. Using this photometer students have determined the concentration of the unknown sample of KMnO4 solutions. The concentration of this sample solution was calculated to be (4.62 ± 0.06) × 10–4 M; this value agrees within 6% of the expected value from the measurement using the commercial spectrophotometer which was calculated to be (4.96 ± 0.005) × 10–4 M. The experiments fit well into an analytical chemistry course and take a standard (1 h) lab period. This project has facilitated improved student understanding of the photometry concepts and increased the creative problem-solving. In general, the students’ response to this laboratory was positive.
中文翻译：
使用基于项目的学习通过测量有色物质的未知浓度来设计，构建和测试学生自制的光度计
学生通过基于项目的学习来学习光度学的原理和实践。他们解决了使用设计，制造和测试所需的光度计测量未知颜色物质浓度的挑战。然后，他们使用该仪器进行实验并应对挑战。学生设计和制造了一个光度计，该光度计由绿色激光指示器作为光源，而光度计则作为检测器和读出器。学生使用此光度计确定了KMnO 4溶液未知样品的浓度。计算得出该样品溶液的浓度为（4.62±0.06）×10 –4M; 该值与使用商业分光光度计测得的预期值相符，在预期值的6％范围内，该值经计算为（4.96±0.005）×10 –4M。该实验很好地适合了分析化学过程并采用了标准（1 h）实验期。该项目促进了学生对光度学概念的理解，并增加了创造性的解决问题的能力。总的来说，学生对该实验室的反应是积极的。
更新日期：2018-01-24
中文翻译：
使用基于项目的学习通过测量有色物质的未知浓度来设计，构建和测试学生自制的光度计
学生通过基于项目的学习来学习光度学的原理和实践。他们解决了使用设计，制造和测试所需的光度计测量未知颜色物质浓度的挑战。然后，他们使用该仪器进行实验并应对挑战。学生设计和制造了一个光度计，该光度计由绿色激光指示器作为光源，而光度计则作为检测器和读出器。学生使用此光度计确定了KMnO 4溶液未知样品的浓度。计算得出该样品溶液的浓度为（4.62±0.06）×10 –4M; 该值与使用商业分光光度计测得的预期值相符，在预期值的6％范围内，该值经计算为（4.96±0.005）×10 –4M。该实验很好地适合了分析化学过程并采用了标准（1 h）实验期。该项目促进了学生对光度学概念的理解，并增加了创造性的解决问题的能力。总的来说，学生对该实验室的反应是积极的。
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