Physical Properties
Molecular weight:214.6; Physical form:White crystals, with a weak intrinsic odour. Density:c. 1.31 (20 °C); Melting point:94.6-96.2 °C; ( tech., 84-91 °C); Vapour pressure:0.4 mPa (20 °C); Henry constant:1.0 × 10-4 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 1.43 ( pH 5), 0.02 ( pH 7), -0.18 ( pH 9) (all 20 °C); pKa:3.68 (20 °C); Solubility:In water 860 mg/l ( pH 7, 20 °C). In acetone, diethyl ether, ethanol >1000, dichloromethane 968, toluene 330, hexane 9 (all in g/ kg, 20 °C).; Stability:Stable to heat, light, and stable in the range pH 3 to pH 9. Photolysis DT50 680 h ( pH 5), 1019 h ( pH 7), 415 h ( pH 9).;