Caustic Soda Synonym: Sodium Hydrate,Sodium Hydroxide Molecular Formula: NaOH Molecular Weight: 40.01 CAS No.: 1310 Caustic SodaProperty : Pure caustic soda is Colorless, transparent crystals, melting point :318.4°C,boiling point:1390°C, crispy. Pure solid caustic soda appear white, block ,flake, bead , easily soluble in water ,can release lots of heat.in water appear alkaline, feeling creamy. ...