The correct answer is $\boxed{\text{NaOH}}$, sodium hydroxide. Sodium hydroxide is a strong base that is used in a variety of industrial and commercial applications. It is used to manufacture soap, rayon, paper, explosives, dyes, and petroleum products. It is also used in water treatment, metal processing, and food processing.
Sodium hydroxide is a white, crystalline solid that is highly soluble in water. It is a strong base and reacts with acids to form salts. It is also a corrosive substance and can cause burns to the skin and eyes.
Sodium hydroxide is produced by the electrolysis of sodium chloride (NaCl) solution. The process involves passing an electric current through a solution of sodium chloride, which causes the sodium ions to be discharged at the cathode and the chlorine ions to be discharged at the anode. The sodium ions combine with water to form sodium hydroxide, while the chlorine ions combine with oxygen to form chlorine gas.
Sodium hydroxide is a versatile and important chemical that is used in a variety of applications. It is a strong base that is used to manufacture soap, rayon, paper, explosives, dyes, and petroleum products. It is also used in water treatment, metal processing, and food processing.