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Sodium dihydrogen phosphate is colorless or white orthorhombic crystals. It is easy to dissolve in water, its aqueous solution is acidic; insoluble in alcohol. It is easy to agglomerate in wet air. It is dehydrated to anhydrous substance at 95℃, converted to acid sodium pyrophosphate at 190-204℃, and formed sodium metaphosphate at 204-244℃.