Acids & Salts Available — Bulk Only

Monopotassium Phosphate (MKP, Potassium Dihydrogen Phosphate)

CAS 7778-77-0 · Formula H2KO4P · MW 136.086 g/mol

A fully water-soluble phosphorus-potassium salt for fertigation, food buffering, and fermentation. It is used as a high-analysis phosphorus-potassium fertilizer for fertigation and foliar feeding, as a buffering and sequestering agent in food, and as a phosphorus-potassium nutrient in fermentation and microbiological media.

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HS Code
2835.24
At a Glance
Material Family
Acids & Salts
Record Type
Pure compound
Primary Role
pH Adjustment
Solubility
Freely soluble in water. Insoluble in ethanol
Functional Roles
POTASSIUM PHOSPHATE
BUFFERING
Applications & Use Cases
  • Fertilizer: Water-soluble phosphorus-potassium source for fertigation and foliar feeding.
  • Food additive: Buffering and sequestering agent.
  • Fermentation nutrient: Phosphorus-potassium nutrient in microbiological and fermentation media.
  • Specialty buffers: pH buffer in technical and laboratory formulations.
Physical Properties
Melting Point
253 °C
Density
2.34 g/cu cm
Solubility
Freely soluble in water. Insoluble in ethanol
pH
Between 4,2 and 4,8 (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 . 24
Chapter 28
Inorganic chemicals; compounds of precious metals and rare-earth metals
Heading 28.35
Internationally harmonized (WCO HS)
Subheading 2835.24
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
7778-77-0
Molecular Formula
H2KO4P
Molecular Weight
136.086 g/mol
IUPAC Name
potassium dihydrogen phosphate
INCI Name
POTASSIUM PHOSPHATE
PubChem CID
InChI Key
GNSKLFRGEWLPPA-UHFFFAOYSA-M
Synonyms & Trade Names
Potassium dihydrogen phosphate Potassium phosphate monobasic MONOPOTASSIUM PHOSPHATE Monobasic potassium phosphate Potassium acid phosphate Phosphoric acid, monopotassium salt Potassium phosphate, monobasic Monopotassium monophosphate Potassium dihydrogen orthophosphate Monopotassium orthophosphate Monopotassium dihydrogen phosphate potassium biphosphate Sorensen's potassium phosphate Potassium dihydrogenorthophosphate KH2PO4 Potassium phosphate (K(H2PO4)) Orthophosphoric acid, monopotassium salt Potassium orthophosphate, dihydrogen
Full Description

Monopotassium phosphate (MKP, potassium dihydrogenphosphate; CAS 7778-77-0) is a fully water-soluble potassium phosphate salt. It is used as a high-analysis phosphorus-potassium fertilizer for fertigation and foliar feeding, as a buffering and sequestering agent in food, and as a phosphorus-potassium nutrient in fermentation and microbiological media.

Frequently Asked Questions

What is monopotassium phosphate (MKP) used for?

Monopotassium phosphate (MKP, CAS 7778-77-0) is a fully water-soluble potassium phosphate salt used as a high-analysis phosphorus-potassium fertilizer for fertigation and foliar feeding, as a buffering and sequestering agent in food, and as a phosphorus-potassium nutrient in fermentation and microbiological media. We supply it in bulk to fertilizer blenders, food processors, and fermentation operations.

Is monopotassium phosphate water soluble?

Yes. MKP (potassium dihydrogen phosphate) is fully water-soluble, which is why it is used as a clear-solution source of phosphorus and potassium in fertigation, foliar feeds, and liquid nutrient and buffer formulations.

What is the formula for monopotassium phosphate?

The molecular formula is H2KO4P (KH2PO4), CAS 7778-77-0. It is the monobasic potassium salt of phosphoric acid, supplying both potassium and phosphorus in a single soluble salt.

What grades and bulk packaging are available for MKP?

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

What is the cost of bulk monopotassium phosphate?

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

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.