Homemade Paper Analytical Device and Digital Image Colorimetry as Tools for Learning about Calibration Curve Methods during the COVID Pandemic: A Remote vs In-Person Class Evaluation

• Leila S. V. Barbosa ^[1] ; Pietra Strauch ^[1] ; Daniele C. M. B. Santos ^[1] ; Maria Graças A. Korn ^[1] ; Rodolfo M. M. Santana ^[1]
  1. [1] Universidade Federal da Bahia

     Universidade Federal da Bahia

     Brasil

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 100, Nº 7, 2023, págs. 2601-2607
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • During the pandemic caused by SARS-CoV-2 (COVID-19), a paper analytical device (PAD) was proposed as a tool for remote laboratory classes for undergraduate chemistry to teach calibration curve concepts. For this experiment, students were taught how to prepare a PAD, calibrate standard solutions, construct a calibration curve, and treat data obtained by colorimetry digital image, by applying household utensils only. The proposed experiment was evaluated considering remote and in-person courses. More than 80% of the students in both groups reached grades greater than 60%. The students’ survey demonstrated that 80 to 100% of the students (n = 6) agreed or strongly agreed that the experiment achieved the learning outcomes concerning the calibration curve. For 50% of the group, it was also found that colorimetric reactions could be more effective than the simple dye impregnation method.