... acetone.4 and melting point about 171 °C.5, boric acid in the water solubility with temperature and increase, and can ... change with steam volatile, In the solubility inorganic acid than in water solubility of small. Heated to 70 to ... gradually dehydration generating partial boric acid, 150 ~ 160 °C when coke boric acid, 300 °C generated boric acid anhydride (B2O3).6, oral - rats ...