... caustic soda has very strong hygroscopicity. Apt to dissolve it in water, send out heat when dissolving, the aqueous solution ... alkaline, there are soft senses ; Dissolve it in the ethanol and glycerin; Do not dissolve it in the acetone , ether . Corrosivity is extremely ... , Cymag , formic acid , oxalic acid , phenol ,etc.. In the petroleum industry, it is used for refining the petroleum products, and ...