Designing a Simple Experimental Kit for Absorbance Measurement in Teaching Chemistry: Determining Sugar Content in Beverages
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Abstract
Lego?, which is a popular toy for all ages has been used as the main material to construct an absorbance measurement kit. The design concept is that the experimental kit was made with materials that are easy to find. Its internal components were simplified to help students clearly understand the concept of the absorbance. Students can build the experimental kit on their own. The designed chemical experiment instrument, utilized as an instructional material, actively promotes learning through its orientation to real-world contexts, predominantly on the topics of spectroscopic methods and the Beer-lambert law. The performance of the experimental kit was tested by measuring the absorbance to investigate the concentration of 3 solutions, which had been prepared in the laboratory. The experimental kit was then applied in a real context to determine sugar content in beverages. The results show the consistency of sugar content in beverages measured by the experimental kit and the one identified on nutrition labels. The relative errors are in the range of ?5% while relative standard deviations is less than 5%. This confirms the accuracy and precision of the experimental kit, indicating its effective performance.
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