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Poor storage of 2,4-dinitrophenylhydrazine

2,4-DNPH is used in a practical exam for U.K. students to complete their “A-level” to complete high school. Students would react an aldehyde or ketone with 2,4-DNPH to produce a colored 2,4-dinitrophenylhydrazone. The experiment had been discontinued but was recently reintroduced. Some schools “have retrieved questionable 2,4-DNPH ‘from the dusty back shelves of the chemical store,’ ” Chemistry World says. If the material dries out, it becomes sensitive to friction and shock. Simply removing the container lid could result in an explosion.

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Poor storage of 2,4-dinitrophenylhydrazine