Pure chemicals for colorless transparent liquid. The relative
density 2.130, melting point , boiling point 318.4 13.9 .
Scenedesmus caustic soda are solid and liquid two kinds: pure solid
caustic soda were white, flake, lump, and bar, qualitative fragile;
Pure liquid caustic soda called liquid alkali, colorless
transparent liquid. Industrial contains impurities, mainly for
sodium chloride and etc, and sometimes also a few ferric oxide.
When dissolved into thick liquid alkali, most impurities floats
liquid surface, separable eliminate. Solid caustic soda strong
hygroscopicity, soluble in water, dissolve exothermic, made a
strong alkali solution, have satiny tactility and bitter taste, can
make the red atmosphere litmus test variable blue, make
phenolphthalein solution red. Also soluble in ethanol and glycerin,
insoluble in acetone, ether and acetic acid. With the acid is up to
meet neutralize effect and salt and water. Have the ability of
saponification, generating oil soap and glycerin. Easily absorb
carbon dioxide and water into carbonate. And chlorine, bromine,
iodine, etc halogen happened was reaction. With metal aluminium
zinc and non-metal silicon, boron and reaction release hydrogen.
Corrosive extremely strong, the skin, fiber, glass, ceramics, etc
are corrode action. Pure sodium hydroxide to white is quilted
opaque solid crystallization, general industrial contains low
sodium chloride and sodium carbonate, a white with light color
gloss a solid crystallization. Sodium hydroxide is one of the
strongest alkali classes, with acid reacts sodium salt. Sodium
hydroxide hygroscopicity is very strong, placed air can absorbs a
large number of moisture and ChaoXie into liquid bases.