Disodium hydrogen phosphate is easily weathered in the air. When it is kept at room temperature, it loses about 5 crystal waters to form heptahydrate. When heated to 100 °C, it loses all crystal water to form an anhydrate. When it is dissolved at 250 °C, it turns into coke. Sodium phosphate. It is easy to weather in the air, and it is easy to lose five molecules of crystal water to form heptahydrate (Na2HPO4.7H2O). Soluble in water, insoluble in alcohol. The aqueous solution was slightly alkaline (pH of 0.1-1 N solution was about 9.0). The crystal water was lost at 100 ° C to form an anhydrate, which was decomposed into sodium pyrophosphate at 250 ° C. The pH of the 1% aqueous solution is 8.8 to 9.2; it is insoluble in alcohol. Melt and lose 5 crystal water at 35.1 °C
Chinese name: disodium hydrogen phosphate
English name: sodium hydrogen phosphate
Chinese alias: disodium phosphate; dibasic sodium phosphate; disodium hydrogen phosphate (food grade); disodium hydrogen phosphate, anhydrous; disodium hydrogen phosphate anhydrous ; disodium phosphate (anhydrous); anhydrous sodium hydrogen phosphate; DSP
CaS number: 7558-79-4
molecular formula: Na2HPO4
molecular weight: 142
