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Sodium Phosphate

Sodium Phosphate

Basic Information

CAS No.: 7601-54-9
Molecular Formula: Na3O4P
Molecular Weight: 163.940671

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Product Details

Disodium phosphate has a high degree of hygroscopicity and water solubility. It can be used in combination with sodium monosodium phosphate when preparing biological buffers. It is usually used as a buffer for biological assays. Sodium is essential for the functions of nerves and muscles.


Chemical Properties
PropertyValue

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

PH

8.9-9.2 (25℃, 50g/L in water)

Pka

(1) 2.15, (2) 6.82, (3) 12.38 (at 25℃)

Odor

odorless

Biological source

synthetic

Water Solubility

>=10 g/100 mL at 20 ºC

Sensitive

Hygroscopic

λmax

λ: 260 nm Amax: 0.019λ: 280 nm Amax: 0.016

Merck

14,8659

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≤0.01 at 280nm


Safety Information

PropertyValue
Hazard symbolsC, Xi
Hazard class codes34-36/37/38
Safety descriptions26-36/37/39-45-24/25
UN dangerous goods numberUN 3262 8/PG 3
WGK Germany1
RTECS numberTC9490000
F34
TSCATSCA listed
Hazard class8
Packing groupIII
HS code28352910
Storage class13 - Non-combustible solids
Hazard class (category)Eye irritation, Category 2
Skin irritation, Category 2
Specific target organ toxicity – single exposure, Category 3
Hazardous substances data7601-54-9 (Hazardous Substances Data)
ToxicityLD50 skin in rabbit: >300 mg/kg


Product Usage

Sodium Phosphate represents a group of versatile inorganic compounds (including MSP, DSP, and TSP) that are essential in various industrial sectors due to their excellent buffering, emulsifying, and sequestering capabilities. In the food industry, it is widely used as a moisture-retention agent, quality improver, and acidity regulator, effectively enhancing the water-holding capacity of meat products and preventing clumping in dairy products. In industrial water treatment, sodium phosphate acts as a crucial scale inhibitor and water softener, preventing boiler scaling by sequestering metal ions. Additionally, it serves as a builder in detergents to enhance cleaning efficiency and as a dyeing assistant in the textile industry. In pharmaceuticals, specific grades are frequently used as saline laxatives or buffering agents in medications.

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