Synonym: lac. Solubility Information: Solubility in water: insoluble. Other solubilities: slightly soluble in alcohol and ether, soluble in carbon disulfide, benzene, (about 2.4%, at 30°C, much more at higher temps.),toluene,, acetone (2.65% at 25°C), chloroform (1.5% at 18°C) Physical Form: Powder. Formula Weight: 32.05