The chemical compound Sodium Sulfide, often known as its hydrate Na2S9H2O, has the formula Na2S. Although technical grades of sodium Sulfide are often yellow to brick red due to the presence of polysulfides and are typically given as a crystalline mass, in flake form, or as a fused solid, both the anhydrous and the hydrated salts are colourless solids in their pure crystalline state. They dissolve in water and produce extremely alkaline solutions.
Na2S and its hydrates release hydrogen Sulfide, a highly poisonous, combustible, and caustic gas with an odour similar to rotten eggs, when they are exposed to damp air. Some commercial samples are labelled as Na2SxH2O, where x is the prescribed weight % of Na2S. The weight of Na2S in commonly accessible grades is about 60%, hence x is roughly 3. These Sodium Sulfide grades are frequently marketed as "sodium Sulfide flakes."
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