Sodium sulfide (Na2S) is an inorganic compound that consists of sodium, sulfur and sometimes water molecules. It exists as a yellow to colorless solid, or as a white crystalline powder. It has an odor similar to rotten eggs due to the presence of hydrogen sulfide. Sodium sulfide is highly soluble in water to form an alkaline solution which is used in many industrial applications. https://hallbook.com.br/blogs/441121/Sodium-Sulfide-A-Comprehensive-Look-at-its-Properties-and-Applications