- Synonyms: Phenyldiazenecarboxylic acid 2-phenylhydrazide, Phenylazoformic acid 2-phenylhydrazide - C13H12N4O - M = 240,27 g/mol - CAS [538-62-5] - EINECS-No.: 208-698-0 - Solub. in water: (20 ºC): insoluble - Melting point: 153 - 158 ºC (decomposes) - Tariff number: 2928 00 90 90 - Applications: analytical chemistry, laboratory reagent, for the detection of: mercury. SPECIFICATIONS assay (HPLC): 35 - 40 % identity (IR-spectrum): passes test melting point: 153 - 158 °C solubility in acetone: passes test insoluble in C2H5OH : passes test residue on ignition: max. 0,1 % suitability for determination of Hg : passes test