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1,Formula: Na2HPO4; Na2HPO4·2H2O
2,Formula wt, anhydrous 141.96
,Formula wt, dihydrate 177.99
3,CAS: anhydrous [7558-79-4]; CAS: dihydrate [10028-24-7]
4,Specificity: Colorless crystal, easily soluble in water, insoluble in ethanol, relative density 1.63,melting point 34.6℃,when heated to 180℃,it may lose crystal water, convert to anhydrous.
5,Packing: 25kg net paper bag or 1mt big bag with PE liner.
| Name of index |
FCC-V |
E339(ii) |
| pH of a 1 % solution |
-- |
8.4-9.6 |
Content(as dry base),≥% |
98.0 |
98.0 |
P2O5 Content(Anhydrous basis),% |
-- |
49.0-51.0 |
Lead, ≤% |
0.0004 |
0.0004 |
Water insoluble(Anhydrous basis)，≤% |
0.2 |
0.2 |
Fluoride, ≤% |
0.005 |
0.001 |
Loss on drying, |
1,Anhydrous:≤5.0%;
2,Dihydrate:18.0%-22.0%. (120℃,4h) |
1,Anhydrous ≤5.0%,
2,Dihydrate ≤22.0%
(40℃,3h then 105℃,5h)) |
As,≤% |
0.0003 |
0.0003 |
Cadmium ≤% |
-- |
0.0001 |
Mercury ≤% |
-- |
0.0001 |
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