Disodium hydrogen phosphate dodecahydrate
Linsuan Qing’erna Shi’ershuihewu
Disodium Hydrogen Phosphate Dodecahydrate
Na2HPO4·12H2O 358.14
[10039-32-4]
This product shall contain not less than 98.0% Na2HPO4 as a dry product.
[Properties] This product is colorless or white crystal or lump.
This product is soluble in water and almost insoluble in ethanol.
[Identification] The aqueous solution of this product shows the identification reaction of sodium salt and phosphate (General rule 0301).
[Check] Take 1.0g of this product, add 20ml of water and dissolve it, then determine according to law (general rule 0631), and the pH value should be 9.0 ~ 9.4.
The clarification and color of the solution take 1.0g of this product, add 10ml of water, fully shake to dissolve, check according to law (general rules 0901 and 0902), the solution should be clear and colorless.
Chloride shall be 5.0g of this product, checked according to law (General rule 0801), and shall not be more concentrated (0.001%) than the control solution made of standard sodium chloride solution 5.0ml.
Take 2.0g of this product for sulfate, check according to law (general rule 0802), and compare with the control solution made of 2.0ml of standard potassium sulfate solution, not more concentrated (0.01%).
Take 2.0g of carbonates, add 10ml of water, boil, cool, add 2ml of hydrochloric acid, there should be no bubbles.
Take 20.0g of the product from the water, heat 100ml of water to dissolve it, filter it with No. 4 vertical melting crucible that has been dried to constant weight at 105℃, wash the precipitate with 200ml of hot water for 10 times, and dry at 105℃ for 2 hours. The remaining residue shall not exceed 10mg(0.05%).
[Category] Pharmaceutical excipients, pH regulators and buffers, etc.
【 Storage 】 Sealed storage.
Note: It is easy to weather in air at room temperature.

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