Properties of Sodium Sulfide
Chemical Formula: Na₂S
Molecular Weight: 78.04
Structure and Composition
Sodium sulfide is highly hygroscopic. It is readily soluble in water, slightly soluble in ethanol, and insoluble in ether. Its aqueous solution is strongly alkaline and can cause burns upon contact with skin or hair. Hence, sodium sulfide is commonly known as sulfide alkali. It oxidizes easily in air and reacts with strong acids to release hydrogen sulfide gas. It can form insoluble metal sulfide precipitates when reacted with various heavy metal salt solutions.

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