Sodium hydroxide (NaOH) has no smell. It is made of solid white crystals that absorb water from the air. Sodium hydroxide is caustic. Sodium hydroxide can harm workers who come in contact with it.

Sodium chloride is an ionic compound found in various foods and medical treatments. More commonly referred to as “salt” or “table salt”. sodium chloride is used as a seasoning in many foods. Medically, sodium chloride solutions are used in catheter flush injections or intravenous infusions, and for cleaning objects such as contact lenses in the form of saline. Sodium chloride inhalation can remove certain bacteria in body secretions.