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Sodium Phosphate Dibasic CAS#7558-79-4

Excellent Water Solubility & Hygroscopicity：Highly soluble and moisture-absorbing, ensuring rapid dissolution and stable performance in formulations.

Ideal Buffer Component：Commonly used with sodium phosphate monobasic to prepare reliable organic and biochemical buffer systems.

Nutritional & Physiological Support：Provides essential sodium and phosphate for normal nerve and muscle function and can be used as a dietary supplement.

Wide Food & Water Treatment Applications：Applied in food processing and water treatment, often in combination with trisodium phosphate for effective conditioning.

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Product Description

Product Description of ‌Sodium Phosphate Dibasic CAS#7558-79-4

Sodium phosphate dibasic is a highly hygroscopic, water-soluble salt. Used with sodium phosphate monobasic to make buffers for biochemical/analytical assays, it serves as a sodium/phosphate nutritional supplement and is applied in food processing and water treatment (often with trisodium phosphate).

Product Application of Sodium Phosphate Dibasic CAS#7558-79-4

Sodium phosphate dibasic is a laboratory reagent and buffering agent used in ceramics, detergents, enamels, textile dyeing, fireproofing, silk processing and boiler water treatment. It also serves as a food sequestrant, nutritional supplement, fertilizer component, soldering enamel ingredient and mild laxative.

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Product Information

Parameters

Melting point	243-245 °C
density	1.064 g/mL at 20 °C
bulk density	880kg/m3
vapor density	4.9 (vs air)
vapor pressure	0Pa at 20℃
FEMA	2398 \| DISODIUM PHOSPHATE
storage temp.	Store at +5°C to +30°C.
solubility	H2O: 0.5 M at 20 °C, clear, colorless
form	powder
color	White
Odor	odorless
PH	8.9-9.2 (25℃, 50g/L in water)
pka	(1) 2.15, (2) 6.82, (3) 12.38 (at 25℃)
biological source	synthetic
Water Solubility	>=10 g/100 mL at 20 ºC
λmax	λ: 260 nm Amax: 0.019
λmax	λ: 280 nm Amax: 0.016
Sensitive	Hygroscopic
Merck	148,659
Stability:	Stable. Incompatible with strong acids. Hygroscopic.
InChIKey	BNIILDVGGAEEIG-UHFFFAOYSA-L
LogP	-2.15
CAS DataBase Reference	7558-79-4(CAS DataBase Reference)
EPA Substance Registry System	Disodium phosphate (7558-79-4)
Absorption	≤0.01 at 260nm
Absorption	≤0.01 at 280nm

Safety Information

Hazard Codes	Xi
Risk Statements	36/37/38
Safety Statements	26-36-24/25
RIDADR	UN 3077 9 / PGIII
WGK Germany	3
RTECS	WC4500000
F	3
TSCA	Yes
HS Code	28352200
Hazardous Substances Data	7558-79-4(Hazardous Substances Data)
Toxicity	LD50 orally in Rabbit: > 2000 mg/kg

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