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Sodium dihydrogen phosphate dihydrate is the dihydrated form of sodium dihydrogen phosphate, an inorganic compound with the chemical formula NaH₂PO₄·2H₂O. It is a white, crystalline solid commonly used in food, water treatment, and as a buffering agent in laboratories.

🏭⚗️ Production
Sodium dihydrogen phosphate is produced by the neutralization of phosphoric acid (H₃PO₄) with sodium carbonate (Na₂CO₃) or sodium hydroxide (NaOH), followed by controlled crystallization to obtain the dihydrate form.

🔬 Properties
It is a white, odorless, water-soluble solid. The dihydrate form melts around 60 °C (with loss of water). In aqueous solutions, it is mildly acidic (pH ~4.5–5 when dissolved in water), making it useful in buffer systems. It is stable under normal conditions and non-combustible.

🧪 Applications
• Buffering agent: Used in biological and chemical laboratories to maintain stable pH in phosphate buffer systems.
• Food additive (E339): Acts as an emulsifier, acidity regulator, and nutrient supplement.
• Water treatment: Helps prevent corrosion in pipes and scale formation.
• Pharmaceuticals: Used in some oral and intravenous formulations as a pH adjuster.
• Agriculture: Sometimes included in fertilizer formulations as a phosphorus source.