All alkali metal compounds are Ionic Giant Structures which are soluble in water . All the chlorides are ionic salts . You must know how to test for these, see Tests for Gases . Sodium hydroxide remains in solution . See Uses of Hydrogen and Uses of Chlorine .
Sodium hydroxide is used in the manufacture of paper , soap and ceramics .
Oxides and Hydroxides . The oxides and hydroxides are alkalis . The oxides react with water to form alkaline hydroxides in solution .