Efficient Colorimetry: Developing an Application to Support Student Digital Colorimetry Experiments

In this study, a new application called "Efficient Colorimetry" was developed to measure solution concentration using digital colorimetry. This app is integrated into the WeChat platform, making it easy to use on a smartphone. The app includes a calibration algorithm that establishes a standard curve by using a standard solution, which is used to prepare solutions of increasing concentration by incremental additions of the standard solution. To analyze sample concentrations, the app takes multiple measurements and uses linear fitting to minimize errors. Additionally, students can complete assignments provided by teachers through online channels. Forty-one ninth-grade students used the app to determine the concentration of Fe3+ in three different sample solutions, demonstrating the app's convenience and accuracy.