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Monosodium Phosphate (MSP, Sodium Phosphate Monobasic)

CAS 7558-80-7 · Formula H2NaO4P · MW 119.977 g/mol

An acidic sodium phosphate buffer for food, water treatment, and cleaning. It is used as an acidity regulator and buffering agent in food, as a sequestrant and emulsifying salt, and in water treatment and cleaning formulations.

Part of Acids & Salts
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HS Code
2835.22
At a Glance
Material Family
Acids & Salts
Record Type
Pure compound
Primary Role
pH Adjustment
Functional Roles
pH Adjustment
INCI Name
SODIUM PHOSPHATE
CosIng Functions
BUFFERING
Industries Served
Beauty & Personal Care Food & Beverage Water Treatment
Applications & Use Cases
  • ▸ Food buffer: Acidity regulator and buffering agent in food processing.
  • ▸ Sequestrant and emulsifying salt: Sequesters metal ions and stabilizes emulsions.
  • ▸ Water treatment: pH control and scale management in water-treatment programs.
  • ▸ Cleaning: Builder and buffer in cleaning formulations.
Physical Properties
Melting Point
Decomposes at 75
Density
2360 kg/cu m
Solubility
121 g/L
pH
Between 4,1 and 5,0 (1 % solution)
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

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HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2835 . 22
Chapter 28
Inorganic chemicals; compounds of precious metals and rare-earth metals
Heading 28.35
Internationally harmonized (WCO HS)
Subheading 2835.22
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
7558-80-7
Molecular Formula
H2NaO4P
Molecular Weight
119.977 g/mol
IUPAC Name
sodium dihydrogen phosphate
INCI Name
SODIUM PHOSPHATE
PubChem CID
23672064
InChI Key
AJPJDKMHJJGVTQ-UHFFFAOYSA-M
Synonyms & Trade Names
Monosodium phosphate SODIUM DIHYDROGEN PHOSPHATE Sodium acid phosphate Sodium phosphate, monobasic Sodium primary phosphate Acid sodium phosphate Monosodium monophosphate Monobasic sodium phosphate Monosodium dihydrogen orthophosphate Monosodium phosphate, anhydrous Monosodium orthophosphate Monosorb XP-4 Primary sodium phosphate Sodium dihydrogen phosphate, anhydrous Sodium phosphate (Na(H2PO4)) Sodium biphosphate anhydrous Monosodium hydrogen phosphate Sodium biphosphate, anhydrous Sodium orthophosphate, primary
Full Description

Monosodium phosphate (MSP, sodium dihydrogenphosphate, sodium phosphate monobasic; CAS 7558-80-7) is an acidic, water-soluble sodium phosphate salt. It is used as an acidity regulator and buffering agent in food, as a sequestrant and emulsifying salt, and in water treatment and cleaning formulations.

Frequently Asked Questions

What is monosodium phosphate used for?

Monosodium phosphate (MSP, CAS 7558-80-7) is an acidic, water-soluble sodium phosphate salt used as an acidity regulator and buffering agent in food processing, as a sequestrant and emulsifying salt, and in water-treatment and cleaning formulations. We supply it in bulk to food processors, water-treatment operations, and cleaning-product formulators.

What is another name for monosodium phosphate?

Monosodium phosphate is also called MSP, sodium dihydrogen phosphate, or sodium phosphate monobasic, CAS 7558-80-7, formula H2NaO4P (NaH2PO4). It is the monobasic sodium salt of phosphoric acid.

Is monosodium phosphate water soluble?

Yes. MSP is a water-soluble sodium phosphate salt, which is the basis for its use as a soluble acidity regulator, buffer, sequestrant, and emulsifying salt, and for pH control in water-treatment programs.

What grades and bulk packaging are available for monosodium phosphate?

We supply MSP in bags, drums, totes, and bulk. Food-grade and technical specifications are confirmed at quotation with the corresponding SDS and CoA. Contact us with your application and volume for a bulk quote.

What is the cost of bulk monosodium phosphate?

Bulk MSP pricing depends on grade, packaging, volume, and market conditions. Request a quote with your target quantity and ship-to location for current pricing and lead time.

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Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.
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