ABSTRACT
CASRN: 100-63-0; DOT: 2572; DOT label: Poison; molecular formula: C6H8N2; FW: 108.14; RTECS: MV8925000; Merck Index: 12, 7447 Physical state, color, and odor: Yellow monoclinic crystals with a faint, aromatic odor. Turns red-brown on exposure to air. Melting point (°C): 19.8 (Weast, 1986) Boiling point (°C): 243 (Weast, 1986) with decomposition (Windholz et al., 1983) Density (g/cm3): 1.0986 at 20 °C (Weast, 1986) Diffusivity in water (x 10-5 cm2/sec): 0.89 at 20 °C using method of Hayduk and Laudie (1974) Dissociation constant, pKa: 8.79 at 15 °C (Windholz et al., 1983) 5.20 at 25 °C (Dean, 1973) Flash point (°C): 88.5 (NIOSH, 1997) Ionization potential (eV): 7.64, 7.74 (Rosenstock et al., 1998) Soil organic carbon/water partition coefficient, log Koc: Unavailable because experimental methods for estimation of this parameter for hydrazines are lacking in the documented literature Octanol/water partition coefficient, log Kow: 1.25 (quoted, Leo et al., 1971) Solubility in organics: Soluble in acetone (Weast, 1986). Miscible with alcohol, benzene, chloroform, and ether (Windholz et al., 1983). Vapor density: 4.42 g/L at 25 °C, 3.73 (air = 1) Vapor pressure (mmHg): 0.04 at 25 °C (NIOSH, 1997)
mg/m3), IDLH 15 ppm; OSHA PEL: TWA 5 ppm (22 mg/m3); ACGIH TLV: TWA 0.1 ppm (adopted). Symptoms of exposure: Acute toxic symptoms include hematuria, vomiting, convulsions, and respiratory arrest (Patnaik, 1992). Toxicity: Acute oral LD50 for guinea pigs 80 mg/kg, rats 188 mg/kg, rabbits 80 mg/kg (quoted, RTECS, 1985). Uses: Reagent for aldehydes, ketones, sugars; manufacturing dyes, and antipyrine; organic synthesis.
