Record Information
Creation date2010-04-08 22:10:40 UTC
Update date2015-07-20 22:58:16 UTC
Primary IDFDB013364
Secondary Accession NumbersNot Available
Chemical Information
FooDB NamePotassium phosphate (K(H2PO4))
DescriptionMonopotassium phosphate, also known as MKP or potassium phosphoric acid, belongs to the class of inorganic compounds known as alkali metal phosphates. These are inorganic compounds in which the largest oxoanion is phosphate, and in which the heaviest atom not in an oxoanion is an alkali metal. Monopotassium phosphate is a moderately acidic compound (based on its pKa). Monopotassium phosphate is an odorless tasting compound.
CAS Number7778-77-0
Monopotassium dihydrogen phosphateChEBI
Monopotassium monophosphateChEBI
Monopotassium orthophosphateChEBI
Orthophosphoric acid, monopotassium saltChEBI
Phosphoric acid, monopotassium saltChEBI
Phosphoric acid, potassium salt (1:1)ChEBI
Potassium acid phosphateChEBI
Potassium dihydrogen orthophosphateChEBI
Potassium phosphateChEBI
Potassium phosphate monobasicChEBI
Sorensen's potassium phosphateChEBI
Monopotassium dihydrogen phosphoric acidGenerator
Monopotassium monophosphoric acidGenerator
Monopotassium orthophosphoric acidGenerator
Orthophosphate, monopotassium saltGenerator
Phosphate, monopotassium saltGenerator
Phosphate, potassium salt (1:1)Generator
Potassium acid phosphoric acidGenerator
Potassium dihydrogen orthophosphoric acidGenerator
Potassium phosphoric acidGenerator
Potassium phosphoric acid monobasicGenerator
Sorensen's potassium phosphoric acidGenerator
Monopotassium phosphoric acidGenerator
Monopotassium phosphateChEBI
Potassium phosphoric acid, monobasicGenerator
Potassium phosphoric acid (K(H2PO4))Generator
7778-77-0 (potassium-H3PO4)biospider
Monobasic potassium phosphatebiospider
Monopotassium monophosphate(aq)biospider
Monopotassium phosphate, 9CI, 8CIdb_source
Phosphate standard for icbiospider
Phosphoric acid, potassium saltbiospider
Potassium dideuterophosphatebiospider
Potassium dihydrogen phosphatebiospider
Potassium dihydrogenorthophosphatebiospider
Potassium dihydrogenphosphatedb_source
Potassium hydrogen phosphate (KH2PO4)biospider
Potassium orthophosphatebiospider
Potassium orthophosphate, dihydrogenbiospider
Potassium phosphate monobasic, acsbiospider
Potassium phosphate monobasic, USANdb_source
Potassium phosphate, monobasicbiospider
Potassium phosphate, monobasic (jan/NF)biospider
Potassium phosphate, monobasic(aq)biospider
Potassium phosphate(aq)biospider
Prim.-potassium phosphatebiospider
Predicted Properties
pKa (Strongest Acidic)1.8ChemAxon
Physiological Charge-2ChemAxon
Hydrogen Acceptor Count4ChemAxon
Hydrogen Donor Count2ChemAxon
Polar Surface Area80.59 ŲChemAxon
Rotatable Bond Count0ChemAxon
Refractivity13.53 m³·mol⁻¹ChemAxon
Polarizability5.53 ųChemAxon
Number of Rings0ChemAxon
Rule of FiveYesChemAxon
Ghose FilterNoChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Chemical FormulaH2KO4P
IUPAC namepotassium dihydrogen phosphate
InChI IdentifierInChI=1S/K.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+1;/p-1
Isomeric SMILES[K+].OP(O)([O-])=O
Average Molecular Weight136.0855
Monoisotopic Molecular Weight135.932776925
Description Belongs to the class of inorganic compounds known as alkali metal phosphates. These are inorganic compounds in which the largest oxoanion is phosphate, and in which the heaviest atom not in an oxoanion is an alkali metal.
KingdomInorganic compounds
Super ClassMixed metal/non-metal compounds
ClassAlkali metal oxoanionic compounds
Sub ClassAlkali metal phosphates
Direct ParentAlkali metal phosphates
Alternative Parents
  • Alkali metal phosphate
  • Inorganic oxide
  • Inorganic salt
Molecular FrameworkNot Available
External Descriptors
OntologyNo ontology term
Physico-Chemical Properties - Experimental
Physico-Chemical Properties - Experimental
Physical stateNot Available
Physical DescriptionNot Available
Mass CompositionH 1.48%; K 28.73%; O 47.03%; P 22.76%DFC
Melting PointMp 272°DFC
Boiling PointNot Available
Experimental Water SolubilityNot Available
Experimental logPNot Available
Experimental pKaNot Available
Isoelectric pointNot Available
ChargeNot Available
Optical RotationNot Available
Spectroscopic UV DataNot Available
DensityNot Available
Refractive IndexNot Available
TypeDescriptionSplash KeyView
Predicted GC-MSPotassium phosphate (K(H2PO4)), non-derivatized, Predicted GC-MS Spectrum - 70eV, Positivesplash10-000i-2900000000-705bf4c492a6a3f08fcaSpectrum
TypeDescriptionSplash KeyView
Predicted MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-000i-4900000000-8816486944077c4e87ddSpectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-0019-5900000000-1f8d744b4dcdaf18002fSpectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-001i-9100000000-2bf1047037e4efb8752aSpectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-0059-9700000000-9e8490b13afdce9b1f40Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-004i-9000000000-520c7e2a186a838278c6Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-004i-9000000000-54e975d41446154675c5Spectrum
NMRNot Available
ChemSpider IDNot Available
ChEMBL IDNot Available
KEGG Compound IDNot Available
Pubchem Compound ID516951
Pubchem Substance IDNot Available
ChEBI IDNot Available
Phenol-Explorer IDNot Available
DrugBank IDNot Available
HMDB IDNot Available
CRC / DFC (Dictionary of Food Compounds) IDHTN08-U:HTN08-U
Dr. Duke IDNot Available
BIGG IDNot Available
KNApSAcK IDNot Available
HET IDNot Available
Food Biomarker OntologyNot Available
VMH IDNot Available
Flavornet IDNot Available
GoodScent IDrw1278271
SuperScent IDNot Available
Wikipedia IDNot Available
Phenol-Explorer Metabolite IDNot Available
Duplicate IDSNot Available
Old DFC IDSNot Available
Associated Foods
FoodContent Range AverageReference
Biological Effects and Interactions
Health Effects / BioactivitiesNot Available
EnzymesNot Available
PathwaysNot Available
MetabolismNot Available
BiosynthesisNot Available
Organoleptic Properties
  1. The Good Scents Company (2009). Flavor and fragrance information catalog. <> Accessed 15.10.23.
MSDSNot Available
Synthesis ReferenceNot Available
General ReferenceNot Available
Content Reference