... : C8H6Cl2O34) Molecule weight: 221.0 5) Melting point: 140.5º C 7) Vapor pressure: 1.86×10-2 mPa (25 ... º C) 9) S.g./density: 0.7-0.8 10) Appearance: ... (pH5), 23180 (pH7), 34196 (pH9) (all in mg/l, 25ºC); in ethanol 1250, diethyl ether 243, heptane 1.1, tolueme ... oils; mono-n-butylamine salt: in water 18 g/l(30ºC)12) Stability: 2, 4-D is a strong acid, and ...