Description
Specifications Table
Product Name – 2,4-Dinitrophenylhydrazine LR
Quantity/Pack Size – 25 g
Form – Powder
Grade – LR (Laboratory Reagent)
Application – Carbonyl group detection, aldehyde/ketone identification
Product Overview
2,4-Dinitrophenylhydrazine (2,4-DNPH) LR is a highly selective reagent for detecting and characterizing aldehydes and ketones through the formation of stable 2,4-dinitrophenylhydrazone derivatives. This orange crystalline powder reacts rapidly with carbonyl compounds to produce vivid orange-red precipitates, enabling clear visual identification. The LR grade ensures consistent purity levels suitable for routine laboratory applications where qualitative analysis is required. The reagent’s stability under standard storage conditions (cool, dry environment) makes it reliable for long-term use. Its solubility in sulfuric acid and ethanol allows for versatile preparation methods, while the resulting hydrazones typically exhibit sharp melting points that aid in compound verification. The product is packaged in airtight containers to prevent moisture absorption and degradation, maintaining its reactivity over extended periods. For optimal results, the reagent should be used in freshly prepared solutions, as prolonged exposure to air may reduce its effectiveness. This chemical serves as a fundamental tool in organic chemistry laboratories for functional group analysis and compound characterization procedures.
FAQs
1. What is the shelf life of 2,4-Dinitrophenylhydrazine LR when stored properly?
The reagent maintains its effectiveness for 2-3 years when stored in a tightly sealed container away from moisture and light at room temperature.
2. Can this reagent detect both aliphatic and aromatic carbonyl compounds?
Yes, 2,4-DNPH reacts with both aliphatic and aromatic aldehydes and ketones, though reaction rates may vary slightly between compound types.
3. What safety precautions should be taken when handling this chemical?
Wear nitrile gloves, safety goggles, and work in a fume hood as the powder is irritating to skin and respiratory system. Avoid inhalation of dust particles.
4. How should the reagent solution be prepared for testing?
Dissolve 0.1-0.2g in 1mL concentrated sulfuric acid, then dilute with 3mL ethanol and 1mL water to make the working solution.
5. What color change indicates a positive test result?
A bright orange to red precipitate formation indicates the presence of carbonyl compounds in the sample being tested.
