Sodium Phosphate, Dibasic, Heptahydrate, Reagent A.C.S.

Assay:98.0-102.0%
Na2HPO4 · 7H2O
pH of a 5% solution:8.79.3 at 25 °C
MAXIMUM ALLOWABLE 
Insoluble matter: 0.005%
Chloride (Cl): 0.001%
Sulfate (SO4): 0.005%
Heavy metals (as Pb): 0.001%
Iron (Fe): 0.001%
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