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Sodium Sulphide Physicochemical Properties:
The anhydrous form is a white crystalline substance that is highly deliquescent. It has a relative density of 1.856 (at 14°C) and a melting point of 1180°C. Sodium Sulphide is soluble in water (solubility: 15.4 g/100 ml at 10°C; 57.2 g/100 ml at 90°C). It reacts with acids to produce hydrogen sulfide. It is slightly soluble in alcohol and insoluble in ether. Its aqueous solution is strongly alkaline, hence it is also known as sulfide alkali. It dissolves sulfur to form sodium polysulfide. Industrial-grade products often appear as pink, reddish-brown, or yellowish-brown lumps due to impurities. Sodium Sulphide is corrosive and toxic. It readily oxidizes in air to form sodium thiosulfate.