What is the more common name for sodium hydroxide?

Sodium hydroxide is commonly known as lye. This compound is an alkaline substance used in various applications, including cleaning products, drain cleaners, and in the manufacturing of soap. Lye is favored in these contexts due to its strong basic properties, which enable it to break down fats and oils effectively.

The other terms provided do not refer specifically to sodium hydroxide. While soda might be associated with various sodium compounds, it does not specifically indicate sodium hydroxide. Salt typically refers to sodium chloride, a completely different chemical compound. Hydrochloric acid is another distinct substance, utilized in various industrial processes and known for its corrosive properties, but it bears no relation to sodium hydroxide. Thus, the correct identification of sodium hydroxide as lye is crucial in understanding both its applications and its chemical properties.