Sodium sulfide is a chemical compound with the formula Na2S. It is composed of sodium cations (Na+) and sulfide anions (S2-). Sodium sulfide is a white crystalline solid with a strong odor of rotten eggs due to the presence of hydrogen sulfide. It is highly soluble in water and forms an alkaline solution.

Sodium sulfide is commonly used in various industrial applications. Here are a few examples:

1. Leather Industry: Sodium sulfide is used in the leather industry for dehairing and deliming processes. It helps remove hair and unwanted materials from animal hides and converts raw hides into leather.

2. Water Treatment: Sodium sulfide is used in water treatment plants to remove heavy metals like copper and lead. It forms insoluble metal sulfides, which can be easily separated from the water.

3. Pulp and Paper Industry: Sodium sulfide is used in the production of pulp and paper. It helps break down lignin, a natural polymer in wood, during the pulping process.

4. Chemical Manufacturing: Sodium sulfide is used as a reagent in various chemical reactions. It is involved in the production of dyes, rubber chemicals, and pharmaceuticals.

5. Mining: In the mining industry, sodium sulfide is used in ore flotation. It helps separate valuable minerals from gangue materials by selectively attracting or repelling certain minerals.

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