Sodium Hydroxide is commonly referred to as what?

Sodium hydroxide is commonly referred to as caustic soda, which is a widely recognized name in both industrial and laboratory settings. The term "caustic" highlights its highly corrosive nature when it comes into contact with organic materials and human tissue, making it important for safety considerations in handling and storage.

Caustic soda is used in various applications including the manufacture of soap, paper, and textiles, as well as in water treatment and chemical production. This name emphasizes its strong alkaline properties and its capability to cause significant chemical burns upon contact.

The other terms in the options refer to different substances: soda ash is sodium carbonate, potash pertains to potassium-containing compounds typically used in fertilizers, and calcium hydroxide is a different compound entirely, known as slaked lime. Each of these substances has distinct chemical properties and uses, which set them apart from sodium hydroxide.