Caustic soda (Sodium Hydroxide)

Caustic Soda a.k.a Sodium hydroxide is a kind of alkali that composes of sodium hydroxide (NaOH). Sodium, never founded by as a native element because

Sodium Hydroxide cyrstals

sodium is a very reactive element that could react with almost every thing. The main source of sodium is founded from sodium chloride as known as table salt and simple salt. It can be separated from using the Downs process. How Caustic Soda is created by putting free state sodium into water or electrolyze sodium chloride.
  Sodium hydroxide is soluble in water, ethanol and methanol. This alkali is deliquescent and readily absorbs moisture and carbon dioxide in air. Sodium hydroxide is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner.