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Direct linkda Silva, Rodrigo Sens; Borges, Endler Marcel – Journal of Chemical Education, 2019
Here, students determine aspirin (acetylsalicylic acid) mass in pharmaceutical tablets using a colorimetric method. Aspirin, salicylate, and salicylic acid do not absorb visible light. Thus, in alkaline medium, acetylsalicylic acid was hydrolyzed to salicylate; then, it was reacted with an acidic Fe(III) solution, and a violet complex was formed.…
Descriptors: Spreadsheets, Drug Therapy, Light, Chemistry
Ledesma, Claudia Martins; Krepsky, Larissa Mascarenhas; Borges, Endler Marcel – Journal of Chemical Education, 2019
Here, students determine the total phenolic content in beers using the Folin-Ciocalteu assay. The Folin-Ciocalteu reagent is a yellow complex, in an alkaline medium; it reacts with phenols and non-phenolic reducing substances to form a blue complex. Quantitative analysis was carried out using absorbance measured at 765 nm (standard method) and…
Descriptors: Science Instruction, Science Experiments, Chemistry, College Science
