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GY-Sodium Dihydrogen Phosphate

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CAS No.:

7558-80-7

Grade:

Food Grade

Content:

98%

Packaging:

25kg/woven bag

Sample Available:

Yes

Price valid (until):

2026-09-19

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Chongqing Guangyi Chemical Co.,Ltd

Company Type:

Trader

Location:

China

Payment Terms:

L/C,TT against B/L draft before shipment,100% TT in advance

Qualification:

Main Products:

DMF,Aniline,Benzene,Phosphoric acid,Hexane,Heptane

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Description

Product Detail

Chemical Name： Sodium Dihydrogen Phosphate

Synonyms： Monosodium phosphate (MSP), Sodium phosphate monobasic, Sodium biphosphate, Acid sodium phosphate

CAS N o： 7558-80-7

Primary Use ： Food (E339 buffer/acidulant), boiler water treatment, tanning, dyeing, detergent, pharma, feed, precursor to poly/pyro/metaphosphates

Items	Specifications
Appearance	White crystalline powder or orthorhombic crystals, odorless, salty-acid taste; very soluble in water
MW	119.98 g/mol
MP / Decomp.	No true mp; thermal conversion from ~169–190 °C to Na₂H₂P₂O₇ then metaphosphate
BP / Decomp.	N/A — decomposes on heating
Density	2.36 g/cm³（anhydrous）
Solubility (H₂O)	~ 59.9 g/100 mL @ 0 °C（~80–90 g/100 mL @ 25 °C）
in EtOH	Practically insoluble
pH（ 1% soln）	4.1–4.7（ acidic）
pKa（H₂PO₄⁻⇌HPO₄²⁻）	≈ 6.8–7.2
Crystal Structure	Orthorhombic
Hygroscopicity	Hygroscopic; <100 °C absorbs crystal water → hydrate
Assay	≥ 98.0%（FCC 98.0–103.0%）
pH (1% soln)	4.1–4.7
Loss on drying	≤ 2.0%
Water-insoluble	≤ 0.2%
Chlorides (as Cl)	≤ 0.02%
Sulfates (as SO₄)	≤ 0.05%
Fluoride (as F)	≤ 0.005% (≤50 mg/kg)
Arsenic (as As)	≤ 0.0003% (≤3 mg/kg)
Lead (as Pb)	≤ 0.0004% (≤4 mg/kg)
Heavy metals (as Pb)	≤ 0.001% (≤10 mg/kg)

ECHEMI Editorial Reference

White, slightly deliquescent crystals or granules. The USP 32 states that monobasic sodium phosphate contains one or two molecules of water of hydration or is anhydrous.
The hydrated forms of monobasic sodium phosphate occur as odorless, colorless or white, slightly deliquescent crystals. The anhydrous form occurs as a white crystalline powder or granules.
DryPowder; DryPowder, PelletsLargeCrystals; Liquid; PelletsLargeCrystals|A white odourless, slightly deliquescent powder, crystals or granules
Sodium dihydrogenphosphate is a sodium phosphate.|Sodium phosphate is a saline laxative that is thought to work by increasing fluid in the small intestine. It usually results in a bowel movement after 30 minutes to 6 hours.

Certificates

Basic Info

Product Name:

Monosodium phosphate

Other Name:

Phosphoric acid,sodium salt (1:1);Phosphoric acid,monosodium salt;Monosodium phosphate;Sodium phosphate (Na(H2PO4));Monobasic sodium phosphate;Dihydrogen sodium phosphate;Sodium dihydrogen orthophosphate;Sodium phosphate,monobasic;Sodium dihydrogen monophosphate;Monosodium dihydrogen orthophosphate;Sodium monobasic phosphate (NaH2PO4);Sodium primary phosphate;Monosodium hydrogen phosphate;Sodium dihydrogen phosphate (NaH2PO4);Sodium dihydrogen phosphate;Sodium hydrogen phosphate (NaH2PO4);Monobasic sodium phosphate (NaH2PO4);Dihydrogen monosodium phosphate;Sodium orthophosphate monobasic;Sodium monobasic phosphate;S 3139;1333-80-8;89140-32-9;943540-07-6

CAS No.:

7558-80-7

Molecular Formula:

H3O4P.Na

InChIKeys:

InChIKey=NFIYTPYOYDDLGO-UHFFFAOYSA-N

Molecular Weight:

119.97700

Exact Mass:

119.95900

EC Number:

618-243-1

UNII:

KH7I04HPUU

DSSTox ID:

DTXSID7035222

Color/Form:

Colorless, monoclinic crystals|White crystalline powder

HScode:

2835220000

Categories:

Inorganic Salts

Characteristics

PSA:

90.40000

XLogP3:

-0.49040

Appearance:

DryPowder; DryPowder, PelletsLargeCrystals; Liquid; PelletsLargeCrystals

Density:

1.40 g/mL at 20ºC

Melting Point:

60 °C

Boiling Point:

158ºC at 760 mmHg

Water Solubility:

In water, 85 g/100 mL

Storage Conditions:

Store at RT.

Toxicity:

LD50 orally in Rabbit: 8290 mg/kg LD50 dermal Rabbit > 7940 mg/kg

Odor:

Odorless

PH:

Between 4,1 and 5,0 (1 % solution)

Dissociation Constants:

The pKa of monosodium phosphate is 6.8-7.2 (depending on the physicochemical characteristics during pKa determination)

Experimental Properties:

SOLN PRODUCES EFFERVESCENCE WITH SODIUM CARBONATE; NEUTRAL, OR PRACTICALLY NEUTRAL, TO METHYL ORANGE TEST SOLN /SODIUM DIHYDROGEN PHOSPHATE MONOHYDRATE/|Slightly hygroscopic ... Has acid reaction; forms sodium acid pyrophosphate at 225-250 °C and sodium metaphosphate at 350-400 °C|Colorless, orthorhombic crystals; MP: 60 °C (decomposes); density: 1.91 g/cu cm; 94.9 g/100 g water at 25 °C. Insoluble in ethanol /Sodium dihydrogen phosphate dihydrate/|Orthorhombic bisphenoidal colorless crystals, mp 60 °C, specific gravity 1.915. At room temp crystallizes with 2H2O. /Sodium dihydrogen phosphate dihydrate/|White, odorless, slightly deliquescent crystals or granules. At 100 °C loses all its water; when ignited it converts into metaphosphate. Freely soluble in water; practically insoluble in alcohol. The aqueous soln is acid. pH of 0.1 molar aq soln at 25 °C: 4.5. /Sodium dihydrogen phosphate monohydrate/|Reacts slowly on exposure to water (moisture) with (some) metals. On burning: release of toxic and corrosive gases/vapours (phosphorus oxides). Reacts violently with (some) acids/bases.

See More Monosodium phosphate Properties 

Hazard Identification

Classification of the substance or mixture

Not classified.

GHS label elements, including precautionary statements

Precautionary statement(s)
Pictogram(s)	No symbol.
Signal word	No signal word
Hazard statement(s)	none
Prevention	none
Response	none
Storage	none
Disposal	none

Other hazards which do not result in classification

no data available

Handling and Storage

Precautions for safe handling

Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.

Conditions for safe storage, including any incompatibilities

Store the container tightly closed in a dry, cool and well-ventilated place. Store apart from foodstuff containers or incompatible materials.

See More Monosodium phosphate Safety Data Sheet 

Seller Information

Business Type:
Trader

Main Products:
DMF,Aniline,Benzene,Phosphoric acid,Hexane,Heptane

Location:
No.19-10 Building 10, No.9 Huoju Rd, Jiulongpo District, Chongqing.

Payment Terms:
L/C,TT against B/L draft before shipment,100% TT in advance

Total Employees:
5-10

Year of Establishment:
2012

Company Certificates
- EMS CERTIFICATION OF REGISTRATION
- OHSMS CERTIFICATION OF REGISTRATION
- QMS CERTIFICATION OF REGISTRATION
Chongqing Guangyi Chemical Co., Ltd. is a professional supplier with in-depth engagement in domestic and global chemical trading markets.

Chongqing Guangyi Chemical

Inquiry History

7 Inquiries

Country	Product	Purchase Quantity	Date Posted
Pakistan	Sodium Dihydrogen Phosphate	1000 KG	May 19, 2026
India	Mono sodium phosphate	30.00 MT	Dec 19, 2025
Pakistan	SODIUM DIHYDROGEN PHOSPHATE	700 KG	Dec 18, 2025
United Kingdom	NaH2PO4	2000 MT	Sep 22, 2025
United Arab Emirates	mono sodium phosphate	100.00 KG	Apr 21, 2025
Bangladesh	Sodium dihydrogen phosphate	70.00 KG	Mar 27, 2025
Pakistan	Mono sodium phophate	1.00 MT	Jan 29, 2024

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GY-Sodium Dihydrogen Phosphate

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