Exploring Chemical Kinetics at Home in Times of Pandemic: Following the Bleaching of Food Dye Allura Red Using a Smartphone

In this communication, a remote experimental activity in chemical kinetics is described, taking into account the quantification based on optical sensor of smartphone. The objective pursued herein to equip students with appropriate tools and strategies required empirically determine parameters rate law including reaction orders, constant (k), frequency factor (A), activation energy (Ea). Typical results proposed protocol are shown discussed framework bleaching food dye allura red (RD40) hypochlorite, as representative example. A graphical approach concentration vs time data measured under condition where [RD40] ≪ [ClO–] (isolation method) suggests first-order respect dye. addition, analysis pseudo-first-order (kobs) shows relationship ClO–. using two-point form Arrhenius equation, values 3.22 × 107 s/M 44.55 kJ/mol were obtained for Ea, respectively. Interestingly, all kinetic (reaction k, A, Ea) same order magnitude those previously reported literature acquired more sophisticated accurate equipment. This experience provides evidence that it possible proceed activities deepen collection during pandemic.