It is extremely caustic and should be handled with caution. It causes severe burns. Sodium Hydroxide is considered 'Dangerous Goods' (UN1823) for transportation and restrictions for shipping apply. What is the interesting part of the story of why sinigang? The chemical formula of sodium hydroxide is NaOH. It is used in the extraction of aluminium by purifying bauxite. Your email address will not be published. Na+ (from NaCl) and H+(from water) tends to move to negative terminal (i.e cathode) while Cl- (from NaCl) and OH-(from water) tends to move to positive terminal(i.e anode). how? What is the dispersion medium of mayonnaise? Sodium hydroxide (NaOH), also known as lye or caustic soda, is a caustic metallic base.