Disodium hydrogen phosphate heptahydrate
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Disodium hydrogen phosphate heptahydrate
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CAS No:
7782-85-6
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Formula:
H3O4P.7H2O.2Na
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Chemical Name:
Disodium hydrogen phosphate heptahydrate
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Synonyms:
Phosphoric acid,disodium salt,heptahydrate;Disodium orthophosphate heptahydrate;Sodium monohydrogen phosphate heptahydrate;Disodium phosphate heptahydrate;Disodium hydrogen phosphate heptahydrate;Sodium phosphate (Na2HPO4) heptahydrate;Sodium phosphate dibasic heptahydrate;Dibasic sodium phosphate heptahydrate;1803394-07-1
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CAS No:
Description
White powder The USP 32 states that dibasic sodium phosphate is dried or
contains, 1, 2, 7, or 12 molecules of water of hydration.
Anhydrous dibasic sodium phosphate occurs as a white powder.
The dihydrate occurs as white or almost white, odorless crystals.
The heptahydrate occurs as colorless crystals or as a white granular
or caked salt that effloresces in warm, dry air. The dodecahydrate
occurs as strongly efflorescent, colorless or transparent crystals.
Characteristics
157.84000
-0.50230
White powder
1.68 g/mL at 25 °C(lit.)
48 °C
158ºC at 760 mmHg
Soluble in water and insoluble in ethanol.
The anhydrous form of dibasic sodium phosphate is hygroscopic.
When heated to 40℃, the dodecahydrate fuses; at 100℃ it loses its
water of crystallization; and at a dull-red heat (about 240℃) it is
converted into the pyrophosphate, Na4P2O7. Aqueous solutions of
dibasic sodium phosphate are stable and may be sterilized by
autoclaving.
The bulk material should be stored in an airtight container, in a
cool, dry place.
4.9 (vs air)
LD50 orally in Rabbit: 12930 mg/kg
Safety Information
UN 3077 9 / PGIII
2
R36/37/38
S26-S36
WC4600000
Xi
P264, P280, P302+P352, P305+P351+P338, P321, P332+P313, P337+P313, P362
H315
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Disodium hydrogen phosphate heptahydrate
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