Promoting Quantitative Analysis in School Chemistry with Technology-Supported Hands-On Laboratory Learning: A Case of Arduino-Based Portable Spectrophotometer

Abstract

This study addresses the need for practical and affordable tools in high school chemistry education, specifically focusing on the development of a simple, portable spectrophotometer. Current educational resources often fall short in providing students with hands-on experience that effectively connects theoretical concepts with real-world applications. The aim of this research is to design and evaluate a cost-effective spectrophotometer for analyzing dye concentrations in beverages, which also serves as a practical tool for teaching chemistry. The methodology includes designing the spectrophotometer with a 5 mm blue LED and an Arduino microcontroller, followed by testing the measurement results of the developed instrument. The instrument's accuracy and precision are assessed by comparing its results with those from standard UV-Vis spectrophotometers. Findings demonstrate that the spectrophotometer achieves an accuracy range of 94-107% and meets precision criteria with %RSD values below 2%. The expected contribution includes offering an accessible tool that enhances student engagement and understanding through a proposed activity involving hypothesis testing and data analysis, thereby integrating scientific argumentation, hands-on activity, and quantification into the learning process.