Disodium hydrogen phosphate, easy weathering in the air, and placed in the air at room temperature to lose about five water of crystallization and form seven water content, lose all when heated to 100 ℃ water of crystallization and anhydride, 250 ℃ when the decomposed into sodium pyrophosphate. It is easily weathered in the air, and it is extremely easy to lose five molecules of crystal water and form seven water. Soluble in water, insoluble in alcohol. The aqueous solution is slightly alkaline (the PH of 0.1-1n solution is 9.0). In 100 ℃ water of crystallization anhydride, lost 250 ℃ is decomposed into sodium pyrophosphate. The pH of the 1% aqueous solution is 8.8 to 9.2; Insoluble in alcohol. 35.1 ℃ melting and lose five water of crystallization.
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