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A Discovery-Learning 2,4-Dinitrophenylhydrazone ExperimentBruno M. Vittimberga and Ben Ruekberg Selections of liquid aldehydes and ketones are proposed for students to determine what property is the best predictor of the color (yellow to red) of their 2,4-dinitrophenylhydrazone derivative. Students may use a computer (spreadsheet or word processor) to analyze their results. Vittimberga, Bruno M.; Ruekberg, Ben. J. Chem. Educ.2006, 83, 1661.