Formula: 2,4-Dinitrophenylhydrazine in acidic solution (HCl/H₂SO₄ and alcohol/water). CAS: Mixture (119-26-6 for DNPH) EC No.: Mixture M (Molar Mass): Not applicable for solution D (Density): ~1.05 - 1.15 g/cm³ mp (Melting Point): Not applicable bp (Boiling Point): Not applicable Optical Rotation: Not applicable

Composition: Typically 0.1-0.2% w/v 2,4-Dinitrophenylhydrazine in 2M HCl (or H₂SO₄) and alcohol. Appearance: Yellow to orange solution. Sensitivity: Produces yellow, orange, or red crystalline precipitates (2,4-dinitrophenylhydrazones) with aldehydes and ketones. Specificity: Test for carbonyl compounds. Stability: Stable for 3 months when stored in a brown bottle.